The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/aio.h

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    1 /*      $NetBSD: aio.h,v 1.7 2008/05/26 17:45:51 rmind 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 /* Prototypes */
  117 void    aio_sysinit(void);
  118 int     aio_init(struct proc *);
  119 void    aio_exit(struct proc *, struct aioproc *);
  120 void    aio_print_jobs(void (*pr)(const char *, ...));
  121 
  122 #endif /* _KERNEL */
  123 
  124 #endif /* _SYS_AIO_H_ */

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