1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD$
29 */
30
31#ifndef _GEOM_VINUM_RAID5_H_
32#define	_GEOM_VINUM_RAID5_H_
33
34/*
35 * A single RAID5 request usually needs more than one I/O transaction,
36 * depending on the state of the associated subdisks and the direction of the
37 * transaction (read or write).
38 */
39
40struct gv_raid5_packet {
41	caddr_t	data;		/* Data buffer of this sub-request- */
42	off_t	length;		/* Size of data buffer. */
43	off_t	lockbase;	/* Deny access to our plex offset. */
44
45	struct bio	*bio;	/* Pointer to the original bio. */
46	struct bio	*parity;  /* The bio containing the parity data. */
47	struct bio	*waiting; /* A bio that need to wait for other bios. */
48
49	TAILQ_HEAD(,gv_bioq)		bits; /* List of subrequests. */
50	TAILQ_ENTRY(gv_raid5_packet)	list; /* Entry in plex's packet list. */
51};
52
53struct gv_raid5_packet * gv_raid5_start(struct gv_plex *, struct bio *,
54		caddr_t, off_t, off_t);
55int	gv_stripe_active(struct gv_plex *, struct bio *);
56
57#endif /* !_GEOM_VINUM_RAID5_H_ */
58