95 lines
3.7 KiB
C
95 lines
3.7 KiB
C
/*
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* Copyright (c) 2004 Lukas Ertl
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _GEOM_VINUM_RAID5_H_
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#define _GEOM_VINUM_RAID5_H_
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/*
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* A single RAID5 request usually needs more than one I/O transaction,
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* depending on the state of the associated subdisks and the direction of the
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* transaction (read or write). Every subrequest of a RAID5 request,
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* represented by a gv_raid_packet, is defined by a gv_raid5_bit.
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*/
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/* A subrequest of a RAID5 read/write operation. */
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struct gv_raid5_bit {
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struct bio *bio; /* BIO of this subrequest. */
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caddr_t buf; /* Data buffer of this subrequest. */
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int malloc; /* Flag if data buffer was malloced. */
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struct g_consumer *consumer; /* Consumer to send the BIO to. */
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TAILQ_ENTRY(gv_raid5_bit) list; /* Entry in the list of this request. */
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};
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/* Container for one or more gv_raid5_bits; represents a RAID5 I/O request. */
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struct gv_raid5_packet {
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caddr_t buf; /* Data buffer of this RAID5 request. */
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off_t length; /* Size of data buffer. */
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off_t lockbase; /* Deny access to our plex offset. */
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off_t offset; /* The drive offset of the subdisk. */
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int bufmalloc; /* Flag if data buffer was malloced. */
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int active; /* Count of active subrequests. */
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int rqcount; /* Count of subrequests. */
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struct bio *bio; /* Pointer to the original bio. */
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caddr_t data; /* Pointer to the original data. */
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struct g_consumer *original; /* Consumer to the data stripe. */
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struct g_consumer *parity; /* Consumer to the parity stripe. */
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/* State of this RAID5 packet. */
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enum {
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SETUP, /* Newly created. */
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VALID, /* Ready for processing. */
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IO, /* Currently doing I/O. */
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FINISH /* Packet has finished. */
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} state;
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/* Type of this RAID5 transaction. */
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enum {
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JUNK, /* Newly created, not valid. */
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NORMAL, /* Normal read or write. */
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ISPARITY, /* Containing only parity data. */
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NOPARITY, /* Parity stripe not available. */
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DEGRADED, /* Data stripe not available. */
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COMBINED /* Data and parity stripes ok, others not. */
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} type;
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TAILQ_HEAD(,gv_raid5_bit) bits; /* List of subrequests. */
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TAILQ_ENTRY(gv_raid5_packet) list; /* Entry in plex's packet list. */
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};
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int gv_build_raid5_req(struct gv_raid5_packet *, struct bio *, caddr_t,
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long, off_t);
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void gv_free_raid5_packet(struct gv_raid5_packet *);
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void gv_raid5_done(struct bio *);
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void gv_raid5_worker(void *);
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struct gv_raid5_packet *gv_new_raid5_packet(void);
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struct gv_raid5_bit *gv_new_raid5_bit(void);
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#endif /* !_GEOM_VINUM_RAID5_H_ */
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