1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004, 2007 Lukas Ertl 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 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 struct gv_raid5_packet { 39 caddr_t data; /* Data buffer of this sub-request- */ 40 off_t length; /* Size of data buffer. */ 41 off_t lockbase; /* Deny access to our plex offset. */ 42 43 struct bio *bio; /* Pointer to the original bio. */ 44 struct bio *parity; /* The bio containing the parity data. */ 45 struct bio *waiting; /* A bio that need to wait for other bios. */ 46 47 TAILQ_HEAD(,gv_bioq) bits; /* List of subrequests. */ 48 TAILQ_ENTRY(gv_raid5_packet) list; /* Entry in plex's packet list. */ 49 }; 50 51 struct gv_raid5_packet * gv_raid5_start(struct gv_plex *, struct bio *, 52 caddr_t, off_t, off_t); 53 int gv_stripe_active(struct gv_plex *, struct bio *); 54 55 #endif /* !_GEOM_VINUM_RAID5_H_ */ 56