1/*-
2 * Copyright (c) 2004, 2007 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
38struct 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
51struct gv_raid5_packet * gv_raid5_start(struct gv_plex *, struct bio *,
52		caddr_t, off_t, off_t);
53int	gv_stripe_active(struct gv_plex *, struct bio *);
54
55#endif /* !_GEOM_VINUM_RAID5_H_ */
56