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_ */ 78