1 /* include/linux/aio_abi.h 2 * 3 * Copyright 2000,2001,2002 Red Hat. 4 * 5 * Written by Benjamin LaHaise <bcrl (at) 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 <asm/byteorder.h> 33 34 typedef __kernel_ulong_t aio_context_t; 35 36 enum { 37 IOCB_CMD_PREAD = 0, 38 IOCB_CMD_PWRITE = 1, 39 IOCB_CMD_FSYNC = 2, 40 IOCB_CMD_FDSYNC = 3, 41 /* These two are experimental. 42 * IOCB_CMD_PREADX = 4, 43 * IOCB_CMD_POLL = 5, 44 */ 45 IOCB_CMD_NOOP = 6, 46 IOCB_CMD_PREADV = 7, 47 IOCB_CMD_PWRITEV = 8, 48 }; 49 50 /* 51 * Valid flags for the "aio_flags" member of the "struct iocb". 52 * 53 * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb" 54 * is valid. 55 */ 56 #define IOCB_FLAG_RESFD (1 << 0) 57 58 /* read() from /dev/aio returns these structures. */ 59 struct io_event { 60 __u64 data; /* the data field from the iocb */ 61 __u64 obj; /* what iocb this event came from */ 62 __s64 res; /* result code for this event */ 63 __s64 res2; /* secondary result */ 64 }; 65 66 /* 67 * we always use a 64bit off_t when communicating 68 * with userland. its up to libraries to do the 69 * proper padding and aio_error abstraction 70 */ 71 72 struct iocb { 73 /* these are internal to the kernel/libc. */ 74 __u64 aio_data; /* data to be returned in event's data */ 75 76 #if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN) 77 __u32 aio_key; /* the kernel sets aio_key to the req # */ 78 __kernel_rwf_t aio_rw_flags; /* RWF_* flags */ 79 #elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN) 80 __kernel_rwf_t aio_rw_flags; /* RWF_* flags */ 81 __u32 aio_key; /* the kernel sets aio_key to the req # */ 82 #else 83 #error edit for your odd byteorder. 84 #endif 85 86 /* common fields */ 87 __u16 aio_lio_opcode; /* see IOCB_CMD_ above */ 88 __s16 aio_reqprio; 89 __u32 aio_fildes; 90 91 __u64 aio_buf; 92 __u64 aio_nbytes; 93 __s64 aio_offset; 94 95 /* extra parameters */ 96 __u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */ 97 98 /* flags for the "struct iocb" */ 99 __u32 aio_flags; 100 101 /* 102 * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an 103 * eventfd to signal AIO readiness to 104 */ 105 __u32 aio_resfd; 106 }; /* 64 bytes */ 107 108 #undef IFBIG 109 #undef IFLITTLE 110 111 #endif /* __LINUX__AIO_ABI_H */ 112 113
