2 * Copyright (c) 2004, 2007 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
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17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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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 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. */
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. */
47 TAILQ_HEAD(,gv_bioq) bits; /* List of subrequests. */
48 TAILQ_ENTRY(gv_raid5_packet) list; /* Entry in plex's packet list. */
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 *);
55 #endif /* !_GEOM_VINUM_RAID5_H_ */