1*6c8f7fc3SBen Gras /* $NetBSD: aio.h,v 1.12 2012/01/07 19:48:19 christos Exp $ */ 2*6c8f7fc3SBen Gras 3*6c8f7fc3SBen Gras /* 4*6c8f7fc3SBen Gras * Copyright (c) 2007, Mindaugas Rasiukevicius <rmind at NetBSD org> 5*6c8f7fc3SBen Gras * All rights reserved. 6*6c8f7fc3SBen Gras * 7*6c8f7fc3SBen Gras * Redistribution and use in source and binary forms, with or without 8*6c8f7fc3SBen Gras * modification, are permitted provided that the following conditions 9*6c8f7fc3SBen Gras * are met: 10*6c8f7fc3SBen Gras * 1. Redistributions of source code must retain the above copyright 11*6c8f7fc3SBen Gras * notice, this list of conditions and the following disclaimer. 12*6c8f7fc3SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 13*6c8f7fc3SBen Gras * notice, this list of conditions and the following disclaimer in the 14*6c8f7fc3SBen Gras * documentation and/or other materials provided with the distribution. 15*6c8f7fc3SBen Gras * 16*6c8f7fc3SBen Gras * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17*6c8f7fc3SBen Gras * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18*6c8f7fc3SBen Gras * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19*6c8f7fc3SBen Gras * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20*6c8f7fc3SBen Gras * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21*6c8f7fc3SBen Gras * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22*6c8f7fc3SBen Gras * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23*6c8f7fc3SBen Gras * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24*6c8f7fc3SBen Gras * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25*6c8f7fc3SBen Gras * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26*6c8f7fc3SBen Gras * SUCH DAMAGE. 27*6c8f7fc3SBen Gras */ 28*6c8f7fc3SBen Gras 29*6c8f7fc3SBen Gras #ifndef _SYS_AIO_H_ 30*6c8f7fc3SBen Gras #define _SYS_AIO_H_ 31*6c8f7fc3SBen Gras 32*6c8f7fc3SBen Gras #include <sys/types.h> 33*6c8f7fc3SBen Gras #include <sys/signal.h> 34*6c8f7fc3SBen Gras 35*6c8f7fc3SBen Gras /* Returned by aio_cancel() */ 36*6c8f7fc3SBen Gras #define AIO_CANCELED 0x1 37*6c8f7fc3SBen Gras #define AIO_NOTCANCELED 0x2 38*6c8f7fc3SBen Gras #define AIO_ALLDONE 0x3 39*6c8f7fc3SBen Gras 40*6c8f7fc3SBen Gras /* LIO opcodes */ 41*6c8f7fc3SBen Gras #define LIO_NOP 0x0 42*6c8f7fc3SBen Gras #define LIO_WRITE 0x1 43*6c8f7fc3SBen Gras #define LIO_READ 0x2 44*6c8f7fc3SBen Gras 45*6c8f7fc3SBen Gras /* LIO modes */ 46*6c8f7fc3SBen Gras #define LIO_NOWAIT 0x0 47*6c8f7fc3SBen Gras #define LIO_WAIT 0x1 48*6c8f7fc3SBen Gras 49*6c8f7fc3SBen Gras /* 50*6c8f7fc3SBen Gras * Asynchronous I/O structure. 51*6c8f7fc3SBen Gras * Defined in the Base Definitions volume of IEEE Std 1003.1-2001 . 52*6c8f7fc3SBen Gras */ 53*6c8f7fc3SBen Gras struct aiocb { 54*6c8f7fc3SBen Gras off_t aio_offset; /* File offset */ 55*6c8f7fc3SBen Gras volatile void *aio_buf; /* I/O buffer in process space */ 56*6c8f7fc3SBen Gras size_t aio_nbytes; /* Length of transfer */ 57*6c8f7fc3SBen Gras int aio_fildes; /* File descriptor */ 58*6c8f7fc3SBen Gras int aio_lio_opcode; /* LIO opcode */ 59*6c8f7fc3SBen Gras int aio_reqprio; /* Request priority offset */ 60*6c8f7fc3SBen Gras struct sigevent aio_sigevent; /* Signal to deliver */ 61*6c8f7fc3SBen Gras 62*6c8f7fc3SBen Gras /* Internal kernel variables */ 63*6c8f7fc3SBen Gras int _state; /* State of the job */ 64*6c8f7fc3SBen Gras int _errno; /* Error value */ 65*6c8f7fc3SBen Gras ssize_t _retval; /* Return value */ 66*6c8f7fc3SBen Gras }; 67*6c8f7fc3SBen Gras 68*6c8f7fc3SBen Gras /* Internal kernel data */ 69*6c8f7fc3SBen Gras #ifdef _KERNEL 70*6c8f7fc3SBen Gras 71*6c8f7fc3SBen Gras /* Default limits of allowed AIO operations */ 72*6c8f7fc3SBen Gras #define AIO_LISTIO_MAX 512 73*6c8f7fc3SBen Gras #define AIO_MAX AIO_LISTIO_MAX * 16 74*6c8f7fc3SBen Gras 75*6c8f7fc3SBen Gras #include <sys/condvar.h> 76*6c8f7fc3SBen Gras #include <sys/lwp.h> 77*6c8f7fc3SBen Gras #include <sys/mutex.h> 78*6c8f7fc3SBen Gras #include <sys/pool.h> 79*6c8f7fc3SBen Gras #include <sys/queue.h> 80*6c8f7fc3SBen Gras 81*6c8f7fc3SBen Gras /* Operations (as flags) */ 82*6c8f7fc3SBen Gras #define AIO_LIO 0x00 83*6c8f7fc3SBen Gras #define AIO_READ 0x01 84*6c8f7fc3SBen Gras #define AIO_WRITE 0x02 85*6c8f7fc3SBen Gras #define AIO_SYNC 0x04 86*6c8f7fc3SBen Gras #define AIO_DSYNC 0x08 87*6c8f7fc3SBen Gras 88*6c8f7fc3SBen Gras /* Job states */ 89*6c8f7fc3SBen Gras #define JOB_NONE 0x0 90*6c8f7fc3SBen Gras #define JOB_WIP 0x1 91*6c8f7fc3SBen Gras #define JOB_DONE 0x2 92*6c8f7fc3SBen Gras 93*6c8f7fc3SBen Gras /* Structure of AIO job */ 94*6c8f7fc3SBen Gras struct aio_job { 95*6c8f7fc3SBen Gras int aio_op; /* Operation code */ 96*6c8f7fc3SBen Gras struct aiocb aiocbp; /* AIO data structure */ 97*6c8f7fc3SBen Gras void *aiocb_uptr; /* User-space pointer for identification of job */ 98*6c8f7fc3SBen Gras TAILQ_ENTRY(aio_job) list; 99*6c8f7fc3SBen Gras struct lio_req *lio; 100*6c8f7fc3SBen Gras }; 101*6c8f7fc3SBen Gras 102*6c8f7fc3SBen Gras /* LIO structure */ 103*6c8f7fc3SBen Gras struct lio_req { 104*6c8f7fc3SBen Gras u_int refcnt; /* Reference counter */ 105*6c8f7fc3SBen Gras struct sigevent sig; /* Signal of lio_listio() calls */ 106*6c8f7fc3SBen Gras }; 107*6c8f7fc3SBen Gras 108*6c8f7fc3SBen Gras /* Structure of AIO data for process */ 109*6c8f7fc3SBen Gras struct aioproc { 110*6c8f7fc3SBen Gras kmutex_t aio_mtx; /* Protects the entire structure */ 111*6c8f7fc3SBen Gras kcondvar_t aio_worker_cv; /* Signals on a new job */ 112*6c8f7fc3SBen Gras kcondvar_t done_cv; /* Signals when the job is done */ 113*6c8f7fc3SBen Gras struct aio_job *curjob; /* Currently processing AIO job */ 114*6c8f7fc3SBen Gras unsigned int jobs_count; /* Count of the jobs */ 115*6c8f7fc3SBen Gras TAILQ_HEAD(, aio_job) jobs_queue;/* Queue of the AIO jobs */ 116*6c8f7fc3SBen Gras struct lwp *aio_worker; /* AIO worker thread */ 117*6c8f7fc3SBen Gras }; 118*6c8f7fc3SBen Gras 119*6c8f7fc3SBen Gras extern u_int aio_listio_max; 120*6c8f7fc3SBen Gras /* Prototypes */ 121*6c8f7fc3SBen Gras void aio_print_jobs(void (*)(const char *, ...) __printflike(1, 2)); 122*6c8f7fc3SBen Gras int aio_suspend1(struct lwp *, struct aiocb **, int, struct timespec *); 123*6c8f7fc3SBen Gras 124*6c8f7fc3SBen Gras #endif /* _KERNEL */ 125*6c8f7fc3SBen Gras 126*6c8f7fc3SBen Gras #endif /* _SYS_AIO_H_ */ 127