78 lines
3.0 KiB
C
78 lines
3.0 KiB
C
/*-
|
|
* Copyright (c) 2004 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#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).
|
|
*/
|
|
|
|
#define GV_ENQUEUE(bp, cbp, pbp) \
|
|
do { \
|
|
if (bp->bio_driver1 == NULL) { \
|
|
bp->bio_driver1 = cbp; \
|
|
} else { \
|
|
pbp = bp->bio_driver1; \
|
|
while (pbp->bio_caller1 != NULL) \
|
|
pbp = pbp->bio_caller1; \
|
|
pbp->bio_caller1 = cbp; \
|
|
} \
|
|
} while (0)
|
|
|
|
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. */
|
|
off_t offset; /* The drive offset of the subdisk. */
|
|
int bufmalloc; /* Flag if data buffer was malloced. */
|
|
int active; /* Count of active subrequests. */
|
|
int rqcount; /* Count of subrequests. */
|
|
|
|
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. */
|
|
};
|
|
|
|
int gv_stripe_active(struct gv_plex *, struct bio *);
|
|
int gv_build_raid5_req(struct gv_plex *, struct gv_raid5_packet *,
|
|
struct bio *, caddr_t, off_t, off_t);
|
|
int gv_check_raid5(struct gv_plex *, struct gv_raid5_packet *,
|
|
struct bio *, caddr_t, off_t, off_t);
|
|
int gv_rebuild_raid5(struct gv_plex *, struct gv_raid5_packet *,
|
|
struct bio *, caddr_t, off_t, off_t);
|
|
void gv_raid5_worker(void *);
|
|
void gv_plex_done(struct bio *);
|
|
|
|
#endif /* !_GEOM_VINUM_RAID5_H_ */
|