76 lines
2.9 KiB
C
76 lines
2.9 KiB
C
/*
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* Copyright (c) 2004 Lukas Ertl
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _GEOM_VINUM_RAID5_H_
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#define _GEOM_VINUM_RAID5_H_
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/*
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* A single RAID5 request usually needs more than one I/O transaction,
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* depending on the state of the associated subdisks and the direction of the
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* transaction (read or write).
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*/
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#define GV_ENQUEUE(bp, cbp, pbp) \
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do { \
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if (bp->bio_driver1 == NULL) { \
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bp->bio_driver1 = cbp; \
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} else { \
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pbp = bp->bio_driver1; \
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while (pbp->bio_caller1 != NULL) \
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pbp = pbp->bio_caller1; \
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pbp->bio_caller1 = cbp; \
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} \
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} while (0);
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struct gv_raid5_packet {
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caddr_t data; /* Data buffer of this sub-request- */
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off_t length; /* Size of data buffer. */
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off_t lockbase; /* Deny access to our plex offset. */
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off_t offset; /* The drive offset of the subdisk. */
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int bufmalloc; /* Flag if data buffer was malloced. */
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int active; /* Count of active subrequests. */
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int rqcount; /* Count of subrequests. */
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struct bio *bio; /* Pointer to the original bio. */
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struct bio *parity; /* The bio containing the parity data. */
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struct bio *waiting; /* A bio that need to wait for other bios. */
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TAILQ_HEAD(,gv_bioq) bits; /* List of subrequests. */
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TAILQ_ENTRY(gv_raid5_packet) list; /* Entry in plex's packet list. */
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};
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int gv_stripe_active(struct gv_plex *, struct bio *);
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int gv_build_raid5_req(struct gv_plex *, struct gv_raid5_packet *,
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struct bio *, caddr_t, off_t, off_t);
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int gv_rebuild_raid5(struct gv_plex *, struct gv_raid5_packet *,
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struct bio *, caddr_t, off_t, off_t);
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void gv_raid5_worker(void *);
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void gv_plex_done(struct bio *);
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#endif /* !_GEOM_VINUM_RAID5_H_ */
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