2 * Copyright (c) 2004 Lukas Ertl
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 #ifndef _GEOM_VINUM_RAID5_H_
30 #define _GEOM_VINUM_RAID5_H_
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).
38 #define GV_ENQUEUE(bp, cbp, pbp) \
40 if (bp->bio_driver1 == NULL) { \
41 bp->bio_driver1 = cbp; \
43 pbp = bp->bio_driver1; \
44 while (pbp->bio_caller1 != NULL) \
45 pbp = pbp->bio_caller1; \
46 pbp->bio_caller1 = cbp; \
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. */
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. */
63 TAILQ_HEAD(,gv_bioq) bits; /* List of subrequests. */
64 TAILQ_ENTRY(gv_raid5_packet) list; /* Entry in plex's packet list. */
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 *);
77 #endif /* !_GEOM_VINUM_RAID5_H_ */