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1/* include/linux/aio_abi.h2 *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 its11 * documentation is hereby granted, provided that the above copyright12 * notice appears in all copies. This software is provided without any13 * warranty, express or implied. Red Hat makes no representations about14 * 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 OF18 * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED19 * OF THE POSSIBILITY OF SUCH DAMAGE.20 *21 * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR23 * PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND24 * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,25 * ENHANCEMENTS, OR MODIFICATIONS.26 */27#ifndef __LINUX__AIO_ABI_H28#define __LINUX__AIO_ABI_H29 30#include <linux/types.h>31#include <linux/fs.h>32#include <asm/byteorder.h>33 34typedef __kernel_ulong_t aio_context_t;35 36enum {37 IOCB_CMD_PREAD = 0,38 IOCB_CMD_PWRITE = 1,39 IOCB_CMD_FSYNC = 2,40 IOCB_CMD_FDSYNC = 3,41 /* 4 was the experimental IOCB_CMD_PREADX */42 IOCB_CMD_POLL = 5,43 IOCB_CMD_NOOP = 6,44 IOCB_CMD_PREADV = 7,45 IOCB_CMD_PWRITEV = 8,46};47 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 * IOCB_FLAG_IOPRIO - Set if the "aio_reqprio" member of the "struct iocb"54 * is valid.55 */56#define IOCB_FLAG_RESFD (1 << 0)57#define IOCB_FLAG_IOPRIO (1 << 1)58 59/* read() from /dev/aio returns these structures. */60struct io_event {61 __u64 data; /* the data field from the iocb */62 __u64 obj; /* what iocb this event came from */63 __s64 res; /* result code for this event */64 __s64 res2; /* secondary result */65};66 67/*68 * we always use a 64bit off_t when communicating69 * with userland. its up to libraries to do the70 * proper padding and aio_error abstraction71 */72 73struct iocb {74 /* these are internal to the kernel/libc. */75 __u64 aio_data; /* data to be returned in event's data */76 77#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)78 __u32 aio_key; /* the kernel sets aio_key to the req # */79 __kernel_rwf_t aio_rw_flags; /* RWF_* flags */80#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)81 __kernel_rwf_t aio_rw_flags; /* RWF_* flags */82 __u32 aio_key; /* the kernel sets aio_key to the req # */83#else84#error edit for your odd byteorder.85#endif86 87 /* common fields */88 __u16 aio_lio_opcode; /* see IOCB_CMD_ above */89 __s16 aio_reqprio;90 __u32 aio_fildes;91 92 __u64 aio_buf;93 __u64 aio_nbytes;94 __s64 aio_offset;95 96 /* extra parameters */97 __u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */98 99 /* flags for the "struct iocb" */100 __u32 aio_flags;101 102 /*103 * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an104 * eventfd to signal AIO readiness to105 */106 __u32 aio_resfd;107}; /* 64 bytes */108 109#undef IFBIG110#undef IFLITTLE111 112#endif /* __LINUX__AIO_ABI_H */113 114