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69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
/*
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* Copyright (c) 2008, XenSource Inc.
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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 are met:
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* * 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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* * 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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* * Neither the name of XenSource Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __IO_OPTIMIZE_H__
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#define __IO_OPTIMIZE_H__
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#include <libaio.h>
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struct opio;
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struct opio_list {
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struct opio *head;
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struct opio *tail;
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};
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struct opio {
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char *buf;
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unsigned long nbytes;
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long long offset;
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void *data;
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struct iocb *iocb;
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struct io_event event;
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struct opio *head;
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struct opio *next;
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struct opio_list list;
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};
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struct opioctx {
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int num_opios;
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int free_opio_cnt;
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struct opio *opios;
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struct opio **free_opios;
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struct iocb **iocb_queue;
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struct io_event *event_queue;
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};
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int opio_init(struct opioctx *ctx, int num_iocbs);
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void opio_free(struct opioctx *ctx);
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int io_merge(struct opioctx *ctx, struct iocb **queue, int num);
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int io_split(struct opioctx *ctx, struct io_event *events, int num);
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int io_expand_iocbs(struct opioctx *ctx, struct iocb **queue, int idx, int num);
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#endif
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