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Uwe Zeisbergerf30c2262006-10-03 23:01:26 +02001/* include/linux/aio_abi.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
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
Jaswinder Singh Rajputbd247b32009-01-30 20:20:10 +053030#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/byteorder.h>
32
33typedef unsigned long aio_context_t;
34
35enum {
36 IOCB_CMD_PREAD = 0,
37 IOCB_CMD_PWRITE = 1,
38 IOCB_CMD_FSYNC = 2,
39 IOCB_CMD_FDSYNC = 3,
40 /* These two are experimental.
41 * IOCB_CMD_PREADX = 4,
42 * IOCB_CMD_POLL = 5,
43 */
44 IOCB_CMD_NOOP = 6,
Badari Pulavartyeed4e512006-09-30 23:28:49 -070045 IOCB_CMD_PREADV = 7,
46 IOCB_CMD_PWRITEV = 8,
Linus Torvalds1da177e2005-04-16 15:20:36 -070047};
48
Davide Libenzi9c3060b2007-05-10 22:23:21 -070049/*
50 * Valid flags for the "aio_flags" member of the "struct iocb".
51 *
52 * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb"
53 * is valid.
54 */
55#define IOCB_FLAG_RESFD (1 << 0)
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057/* read() from /dev/aio returns these structures. */
58struct io_event {
59 __u64 data; /* the data field from the iocb */
60 __u64 obj; /* what iocb this event came from */
61 __s64 res; /* result code for this event */
62 __s64 res2; /* secondary result */
63};
64
65#if defined(__LITTLE_ENDIAN)
66#define PADDED(x,y) x, y
67#elif defined(__BIG_ENDIAN)
68#define PADDED(x,y) y, x
69#else
70#error edit for your odd byteorder.
71#endif
72
73/*
74 * we always use a 64bit off_t when communicating
75 * with userland. its up to libraries to do the
76 * proper padding and aio_error abstraction
77 */
78
79struct iocb {
80 /* these are internal to the kernel/libc. */
81 __u64 aio_data; /* data to be returned in event's data */
82 __u32 PADDED(aio_key, aio_reserved1);
83 /* the kernel sets aio_key to the req # */
84
85 /* common fields */
86 __u16 aio_lio_opcode; /* see IOCB_CMD_ above */
87 __s16 aio_reqprio;
88 __u32 aio_fildes;
89
90 __u64 aio_buf;
91 __u64 aio_nbytes;
92 __s64 aio_offset;
93
94 /* extra parameters */
95 __u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */
Davide Libenzi9c3060b2007-05-10 22:23:21 -070096
97 /* flags for the "struct iocb" */
98 __u32 aio_flags;
99
100 /*
101 * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an
102 * eventfd to signal AIO readiness to
103 */
104 __u32 aio_resfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}; /* 64 bytes */
106
107#undef IFBIG
108#undef IFLITTLE
109
110#endif /* __LINUX__AIO_ABI_H */
111