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/*
* Copyright (c) 2008, XenSource Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of XenSource Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
* 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.
*/
#ifndef __IO_OPTIMIZE_H__
#define __IO_OPTIMIZE_H__
#include <libaio.h>
struct opio;
struct opio_list {
struct opio *head;
struct opio *tail;
};
struct opio {
char *buf;
unsigned long nbytes;
long long offset;
void *data;
struct iocb *iocb;
struct io_event event;
struct opio *head;
struct opio *next;
struct opio_list list;
};
struct opioctx {
int num_opios;
int free_opio_cnt;
struct opio *opios;
struct opio **free_opios;
struct iocb **iocb_queue;
struct io_event *event_queue;
};
int opio_init(struct opioctx *ctx, int num_iocbs);
void opio_free(struct opioctx *ctx);
int io_merge(struct opioctx *ctx, struct iocb **queue, int num);
int io_split(struct opioctx *ctx, struct io_event *events, int num);
int io_expand_iocbs(struct opioctx *ctx, struct iocb **queue, int idx, int num);
#endif
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