[mirror_ubuntu-bionic-kernel.git] / include / linux / aio_abi.h

/* include/linux/aio_abi.h
 *
 * Copyright 2000,2001,2002 Red Hat.
 *
 * Written by Benjamin LaHaise <bcrl@kvack.org>
 *
 * Distribute under the terms of the GPLv2 (see ../../COPYING) or under 
 * the following terms.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, provided that the above copyright
 * notice appears in all copies.  This software is provided without any
 * warranty, express or implied.  Red Hat makes no representations about
 * the suitability of this software for any purpose.
 *
 * IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
 * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
 * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
 * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 * ENHANCEMENTS, OR MODIFICATIONS.
 */
#ifndef __LINUX__AIO_ABI_H
#define __LINUX__AIO_ABI_H

#include <asm/byteorder.h>

typedef unsigned long	aio_context_t;

enum {
	IOCB_CMD_PREAD = 0,
	IOCB_CMD_PWRITE = 1,
	IOCB_CMD_FSYNC = 2,
	IOCB_CMD_FDSYNC = 3,
	/* These two are experimental.
	 * IOCB_CMD_PREADX = 4,
	 * IOCB_CMD_POLL = 5,
	 */
	IOCB_CMD_NOOP = 6,
	IOCB_CMD_PREADV = 7,
	IOCB_CMD_PWRITEV = 8,
};

/*
 * Valid flags for the "aio_flags" member of the "struct iocb".
 *
 * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb"
 *                   is valid.
 */
#define IOCB_FLAG_RESFD		(1 << 0)

/* read() from /dev/aio returns these structures. */
struct io_event {
	__u64		data;		/* the data field from the iocb */
	__u64		obj;		/* what iocb this event came from */
	__s64		res;		/* result code for this event */
	__s64		res2;		/* secondary result */
};

#if defined(__LITTLE_ENDIAN)
#define PADDED(x,y)	x, y
#elif defined(__BIG_ENDIAN)
#define PADDED(x,y)	y, x
#else
#error edit for your odd byteorder.
#endif

/*
 * we always use a 64bit off_t when communicating
 * with userland.  its up to libraries to do the
 * proper padding and aio_error abstraction
 */

struct iocb {
	/* these are internal to the kernel/libc. */
	__u64	aio_data;	/* data to be returned in event's data */
	__u32	PADDED(aio_key, aio_reserved1);
				/* the kernel sets aio_key to the req # */

	/* common fields */
	__u16	aio_lio_opcode;	/* see IOCB_CMD_ above */
	__s16	aio_reqprio;
	__u32	aio_fildes;

	__u64	aio_buf;
	__u64	aio_nbytes;
	__s64	aio_offset;

	/* extra parameters */
	__u64	aio_reserved2;	/* TODO: use this for a (struct sigevent *) */

	/* flags for the "struct iocb" */
	__u32	aio_flags;

	/*
	 * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an
	 * eventfd to signal AIO readiness to
	 */
	__u32	aio_resfd;
}; /* 64 bytes */

#undef IFBIG
#undef IFLITTLE

#endif /* __LINUX__AIO_ABI_H */
Commit	Line	Data
f30c2269	1	/* include/linux/aio_abi.h
1da177e4 LT	2	*
	3	* Copyright 2000,2001,2002 Red Hat.
	4	*
	5	* Written by Benjamin LaHaise <bcrl@kvack.org>
	6	*
	7	* Distribute under the terms of the GPLv2 (see ../../COPYING) or under
	8	* the following terms.
	9	*
	10	* Permission to use, copy, modify, and distribute this software and its
	11	* documentation is hereby granted, provided that the above copyright
	12	* notice appears in all copies. This software is provided without any
	13	* warranty, express or implied. Red Hat makes no representations about
	14	* the suitability of this software for any purpose.
	15	*
	16	* IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
	17	* SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
	18	* THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED
	19	* OF THE POSSIBILITY OF SUCH DAMAGE.
	20	*
	21	* RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	23	* PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
	24	* RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
	25	* ENHANCEMENTS, OR MODIFICATIONS.
	26	*/
	27	#ifndef __LINUX__AIO_ABI_H
	28	#define __LINUX__AIO_ABI_H
	29
	30	#include <asm/byteorder.h>
	31
	32	typedef unsigned long aio_context_t;
	33
	34	enum {
	35	IOCB_CMD_PREAD = 0,
	36	IOCB_CMD_PWRITE = 1,
	37	IOCB_CMD_FSYNC = 2,
	38	IOCB_CMD_FDSYNC = 3,
	39	/* These two are experimental.
	40	* IOCB_CMD_PREADX = 4,
	41	* IOCB_CMD_POLL = 5,
	42	*/
	43	IOCB_CMD_NOOP = 6,
eed4e51f BP	44	IOCB_CMD_PREADV = 7,
eed4e51f BP	45	IOCB_CMD_PWRITEV = 8,
1da177e4 LT	46	};
1da177e4 LT	47
9c3060be DL	48	/*
	49	* Valid flags for the "aio_flags" member of the "struct iocb".
	50	*
	51	* IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb"
	52	* is valid.
	53	*/
	54	#define IOCB_FLAG_RESFD (1 << 0)
	55
1da177e4 LT	56	/* read() from /dev/aio returns these structures. */
	57	struct io_event {
	58	__u64 data; /* the data field from the iocb */
	59	__u64 obj; /* what iocb this event came from */
	60	__s64 res; /* result code for this event */
	61	__s64 res2; /* secondary result */
	62	};
	63
	64	#if defined(__LITTLE_ENDIAN)
	65	#define PADDED(x,y) x, y
	66	#elif defined(__BIG_ENDIAN)
	67	#define PADDED(x,y) y, x
	68	#else
	69	#error edit for your odd byteorder.
	70	#endif
	71
	72	/*
	73	* we always use a 64bit off_t when communicating
	74	* with userland. its up to libraries to do the
	75	* proper padding and aio_error abstraction
	76	*/
	77
	78	struct iocb {
	79	/* these are internal to the kernel/libc. */
	80	__u64 aio_data; /* data to be returned in event's data */
	81	__u32 PADDED(aio_key, aio_reserved1);
	82	/* the kernel sets aio_key to the req # */
	83
	84	/* common fields */
	85	__u16 aio_lio_opcode; /* see IOCB_CMD_ above */
	86	__s16 aio_reqprio;
	87	__u32 aio_fildes;
	88
	89	__u64 aio_buf;
	90	__u64 aio_nbytes;
	91	__s64 aio_offset;
	92
	93	/* extra parameters */
	94	__u64 aio_reserved2; /* TODO: use this for a (struct sigevent ) /
9c3060be DL	95
	96	/* flags for the "struct iocb" */
	97	__u32 aio_flags;
	98
	99	/*
	100	* if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an
	101	* eventfd to signal AIO readiness to
	102	*/
	103	__u32 aio_resfd;
1da177e4 LT	104	}; /* 64 bytes */
	105
	106	#undef IFBIG
	107	#undef IFLITTLE
	108
	109	#endif /* __LINUX__AIO_ABI_H */
	110