1 /* $NetBSD: aio.h,v 1.9 2009/01/11 02:45:55 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2007, Mindaugas Rasiukevicius <rmind at NetBSD org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _SYS_AIO_H_ 30 #define _SYS_AIO_H_ 31 32 /* Returned by aio_cancel() */ 33 #define AIO_CANCELED 0x1 34 #define AIO_NOTCANCELED 0x2 35 #define AIO_ALLDONE 0x3 36 37 /* LIO opcodes */ 38 #define LIO_NOP 0x0 39 #define LIO_WRITE 0x1 40 #define LIO_READ 0x2 41 42 /* LIO modes */ 43 #define LIO_NOWAIT 0x0 44 #define LIO_WAIT 0x1 45 46 /* 47 * Asynchronous I/O structure. 48 * Defined in the Base Definitions volume of IEEE Std 1003.1-2001 . 49 */ 50 struct aiocb { 51 off_t aio_offset; /* File offset */ 52 volatile void *aio_buf; /* I/O buffer in process space */ 53 size_t aio_nbytes; /* Length of transfer */ 54 int aio_fildes; /* File descriptor */ 55 int aio_lio_opcode; /* LIO opcode */ 56 int aio_reqprio; /* Request priority offset */ 57 struct sigevent aio_sigevent; /* Signal to deliver */ 58 59 /* Internal kernel variables */ 60 int _state; /* State of the job */ 61 int _errno; /* Error value */ 62 ssize_t _retval; /* Return value */ 63 }; 64 65 /* Internal kernel data */ 66 #ifdef _KERNEL 67 68 /* Default limits of allowed AIO operations */ 69 #define AIO_LISTIO_MAX 512 70 #define AIO_MAX AIO_LISTIO_MAX * 16 71 72 #include <sys/condvar.h> 73 #include <sys/lwp.h> 74 #include <sys/mutex.h> 75 #include <sys/pool.h> 76 #include <sys/queue.h> 77 78 /* Operations (as flags) */ 79 #define AIO_LIO 0x00 80 #define AIO_READ 0x01 81 #define AIO_WRITE 0x02 82 #define AIO_SYNC 0x04 83 #define AIO_DSYNC 0x08 84 85 /* Job states */ 86 #define JOB_NONE 0x0 87 #define JOB_WIP 0x1 88 #define JOB_DONE 0x2 89 90 /* Structure of AIO job */ 91 struct aio_job { 92 int aio_op; /* Operation code */ 93 struct aiocb aiocbp; /* AIO data structure */ 94 void *aiocb_uptr; /* User-space pointer for identification of job */ 95 TAILQ_ENTRY(aio_job) list; 96 struct lio_req *lio; 97 }; 98 99 /* LIO structure */ 100 struct lio_req { 101 u_int refcnt; /* Reference counter */ 102 struct sigevent sig; /* Signal of lio_listio() calls */ 103 }; 104 105 /* Structure of AIO data for process */ 106 struct aioproc { 107 kmutex_t aio_mtx; /* Protects the entire structure */ 108 kcondvar_t aio_worker_cv; /* Signals on a new job */ 109 kcondvar_t done_cv; /* Signals when the job is done */ 110 struct aio_job *curjob; /* Currently processing AIO job */ 111 unsigned int jobs_count; /* Count of the jobs */ 112 TAILQ_HEAD(, aio_job) jobs_queue;/* Queue of the AIO jobs */ 113 struct lwp *aio_worker; /* AIO worker thread */ 114 }; 115 116 extern u_int aio_listio_max; 117 /* Prototypes */ 118 void aio_print_jobs(void (*pr)(const char *, ...)); 119 int aio_suspend1(struct lwp *, struct aiocb **, int, struct timespec *); 120 121 #endif /* _KERNEL */ 122 123 #endif /* _SYS_AIO_H_ */ 124