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1/* include/linux/aio_abi.h
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 <linux/types.h>
31#include <linux/fs.h>
32#include <linux/signal.h>
33#include <asm/byteorder.h>
34
35typedef __kernel_ulong_t aio_context_t;
36
37enum {
38 IOCB_CMD_PREAD = 0,
39 IOCB_CMD_PWRITE = 1,
40 IOCB_CMD_FSYNC = 2,
41 IOCB_CMD_FDSYNC = 3,
42 /* These two are experimental.
43 * IOCB_CMD_PREADX = 4,
44 * IOCB_CMD_POLL = 5,
45 */
46 IOCB_CMD_NOOP = 6,
47 IOCB_CMD_PREADV = 7,
48 IOCB_CMD_PWRITEV = 8,
49};
50
51/*
52 * Valid flags for the "aio_flags" member of the "struct iocb".
53 *
54 * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb"
55 * is valid.
56 */
57#define IOCB_FLAG_RESFD (1 << 0)
58#define IOCB_FLAG_IOPRIO (1 << 1)
59
60/* read() from /dev/aio returns these structures. */
61struct io_event {
62 __u64 data; /* the data field from the iocb */
63 __u64 obj; /* what iocb this event came from */
64 __s64 res; /* result code for this event */
65 __s64 res2; /* secondary result */
66};
67
68/*
69 * we always use a 64bit off_t when communicating
70 * with userland. its up to libraries to do the
71 * proper padding and aio_error abstraction
72 */
73
74struct iocb {
75 /* these are internal to the kernel/libc. */
76 __u64 aio_data; /* data to be returned in event's data */
77
78#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
79 __u32 aio_key; /* the kernel sets aio_key to the req # */
80 __kernel_rwf_t aio_rw_flags; /* RWF_* flags */
81#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)
82 __kernel_rwf_t aio_rw_flags; /* RWF_* flags */
83 __u32 aio_key; /* the kernel sets aio_key to the req # */
84#else
85#error edit for your odd byteorder.
86#endif
87
88 /* common fields */
89 __u16 aio_lio_opcode; /* see IOCB_CMD_ above */
90 __s16 aio_reqprio;
91 __u32 aio_fildes;
92
93 __u64 aio_buf;
94 __u64 aio_nbytes;
95 __s64 aio_offset;
96
97 /* extra parameters */
98 __u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */
99
100 /* flags for the "struct iocb" */
101 __u32 aio_flags;
102
103 /*
104 * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an
105 * eventfd to signal AIO readiness to
106 */
107 __u32 aio_resfd;
108}; /* 64 bytes */
109
110#undef IFBIG
111#undef IFLITTLE
112
113struct __aio_sigset {
114 const sigset_t __user *sigmask;
115 size_t sigsetsize;
116};
117
118#endif /* __LINUX__AIO_ABI_H */
119