Archipelago » blktap-utils

/* Copyright (c) 2007, XenSource Inc.

 * All rights reserved.

 */

#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