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/*
* Copyright (c) 2004 Lukas Ertl
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _GEOM_VINUM_RAID5_H_
#define _GEOM_VINUM_RAID5_H_
/*
* A single RAID5 request usually needs more than one I/O transaction,
* depending on the state of the associated subdisks and the direction of the
* transaction (read or write). Every subrequest of a RAID5 request,
* represented by a gv_raid_packet, is defined by a gv_raid5_bit.
*/
/* A subrequest of a RAID5 read/write operation. */
struct gv_raid5_bit {
struct bio *bio; /* BIO of this subrequest. */
caddr_t buf; /* Data buffer of this subrequest. */
int malloc; /* Flag if data buffer was malloced. */
struct g_consumer *consumer; /* Consumer to send the BIO to. */
TAILQ_ENTRY(gv_raid5_bit) list; /* Entry in the list of this request. */
};
/* Container for one or more gv_raid5_bits; represents a RAID5 I/O request. */
struct gv_raid5_packet {
caddr_t buf; /* Data buffer of this RAID5 request. */
off_t length; /* Size of data buffer. */
off_t lockbase; /* Deny access to our plex offset. */
off_t offset; /* The drive offset of the subdisk. */
int bufmalloc; /* Flag if data buffer was malloced. */
int active; /* Count of active subrequests. */
int rqcount; /* Count of subrequests. */
struct bio *bio; /* Pointer to the original bio. */
caddr_t data; /* Pointer to the original data. */
struct g_consumer *original; /* Consumer to the data stripe. */
struct g_consumer *parity; /* Consumer to the parity stripe. */
/* State of this RAID5 packet. */
enum {
SETUP, /* Newly created. */
VALID, /* Ready for processing. */
IO, /* Currently doing I/O. */
FINISH /* Packet has finished. */
} state;
/* Type of this RAID5 transaction. */
enum {
JUNK, /* Newly created, not valid. */
NORMAL, /* Normal read or write. */
ISPARITY, /* Containing only parity data. */
NOPARITY, /* Parity stripe not available. */
DEGRADED, /* Data stripe not available. */
COMBINED /* Data and parity stripes ok, others not. */
} type;
TAILQ_HEAD(,gv_raid5_bit) bits; /* List of subrequests. */
TAILQ_ENTRY(gv_raid5_packet) list; /* Entry in plex's packet list. */
};
int gv_build_raid5_req(struct gv_raid5_packet *, struct bio *, caddr_t,
long, off_t);
void gv_raid5_done(struct bio *);
void gv_raid5_worker(void *);
struct gv_raid5_packet *gv_new_raid5_packet(void);
struct gv_raid5_bit *gv_new_raid5_bit(void);
#endif /* !_GEOM_VINUM_RAID5_H_ */
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