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/*-
* Copyright (c) 2006 Li, Xiao <intron@intron.ac>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
/*
* Linux Kernel Implementation of Asynchronous I/O
*/
#ifndef _LINUX_AIO_H_
#define _LINUX_AIO_H_
typedef unsigned long linux_aio_context_t;
enum {
LINUX_IOCB_CMD_PREAD = 0,
LINUX_IOCB_CMD_PWRITE = 1,
LINUX_IOCB_CMD_FSYNC = 2,
LINUX_IOCB_CMD_FDSYNC = 3,
#if 0
LINUX_IOCB_CMD_PREADX = 4,
LINUX_IOCB_CMD_POLL = 5,
#endif
LINUX_IOCB_CMD_NOOP = 6,
};
struct linux_io_event {
uint64_t data;
uint64_t obj;
int64_t res;
int64_t res2;
};
#if _BYTE_ORDER == _LITTLE_ENDIAN
#define LINUX_AIO_PADDED(x,y) x,y
#elif _BYTE_ORDER == _BIG_ENDIAN
#define LINUX_AIO_PADDED(x,y) y,x
#else
#error Unidentified byte order !!!
#endif
struct linux_iocb {
uint64_t aio_data;
uint32_t LINUX_AIO_PADDED(aio_key, aio_reserved1);
uint16_t aio_lio_opcode;
int16_t aio_reqprio;
uint32_t aio_fildes;
uint64_t aio_buf;
uint64_t aio_nbytes;
int64_t aio_offset;
uint64_t aio_reserved2; /* TODO: use this for a (struct sigevent *) */
uint64_t aio_reserved3;
};
/* User space context information structure */
struct linux_aio_ring {
l_uint ring_id;
l_uint ring_nr;
l_uint ring_head;
l_uint ring_tail;
#define LINUX_AIO_RING_MAGIC 0xa10a10a1
l_uint ring_magic;
#define LINUX_AIO_RING_COMPAT_FEATURES 1
l_uint ring_compat_features;
#define LINUX_AIO_RING_INCOMPAT_FEATURES 0
l_uint ring_incompat_features;
l_uint ring_header_length; /* Size of this structure */
struct linux_io_event ring_io_events[0];
};
#endif /* !_LINUX_AIO_H_ */
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