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/*

 * QEMU posix-aio emulation

 *

 * Copyright IBM, Corp. 2008

 *

 * Authors:

 *  Anthony Liguori   <aliguori@us.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2.  See

 * the COPYING file in the top-level directory.

 *

 */

#ifndef QEMU_POSIX_AIO_COMPAT_H

#define QEMU_POSIX_AIO_COMPAT_H

#include <sys/types.h>

#include <unistd.h>

#include <signal.h>

#include "sys-queue.h"

#define QEMU_PAIO_CANCELED     0x01

#define QEMU_PAIO_NOTCANCELED  0x02

#define QEMU_PAIO_ALLDONE      0x03

struct qemu_paiocb

{

    int aio_fildes;

    union {

        struct iovec *aio_iov;

        void *aio_ioctl_buf;

    };

    int aio_niov;

    size_t aio_nbytes;

#define aio_ioctl_cmd   aio_nbytes /* for QEMU_PAIO_IOCTL */

    int ev_signo;

    off_t aio_offset;

    unsigned aio_flags;

/* 512 byte alignment required for buffer, offset and length */

#define QEMU_AIO_SECTOR_ALIGNED        0x01

    /* private */

    TAILQ_ENTRY(qemu_paiocb) node;

    int aio_type;

#define QEMU_PAIO_READ         0x01

#define QEMU_PAIO_WRITE        0x02

#define QEMU_PAIO_IOCTL        0x03

    ssize_t ret;

    int active;

};

struct qemu_paioinit

{

    unsigned int aio_threads;

    unsigned int aio_num;

    unsigned int aio_idle_time;

};

int qemu_paio_init(struct qemu_paioinit *aioinit);

int qemu_paio_read(struct qemu_paiocb *aiocb);

int qemu_paio_write(struct qemu_paiocb *aiocb);

int qemu_paio_ioctl(struct qemu_paiocb *aiocb);

int qemu_paio_error(struct qemu_paiocb *aiocb);

ssize_t qemu_paio_return(struct qemu_paiocb *aiocb);

int qemu_paio_cancel(int fd, struct qemu_paiocb *aiocb);

#endif