bio.h

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    1 /*
    2  * Copyright (c) 2004, 2005 The DragonFly Project.  All rights reserved.
    3  *
    4  * This code is derived from software contributed to The DragonFly Project
    5  * by Hiten Pandya <hmp@backplane.com>.
    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  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in
   15  *    the documentation and/or other materials provided with the
   16  *    distribution.
   17  * 3. Neither the name of The DragonFly Project nor the names of its
   18  *    contributors may be used to endorse or promote products derived
   19  *    from this software without specific, prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
   25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
   27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * $DragonFly: src/sys/sys/bio.h,v 1.6 2008/07/14 03:08:58 dillon Exp $
   35  */
   36 
   37 #ifndef _SYS_BIO_H_
   38 #define _SYS_BIO_H_
   39 
   40 #ifndef _SYS_TYPES_H_
   41 #include <sys/types.h>
   42 #endif
   43 #ifndef _SYS_QUEUE_H_
   44 #include <sys/queue.h>
   45 #endif
   46 
   47 struct bio;
   48 struct bio_track;
   49 struct disk;
   50 typedef void biodone_t(struct bio *);
   51 
   52 /*
   53  * BIO encapsulation for storage drivers and systems that do not require
   54  * caching support for underlying blocks.
   55  *
   56  * NOTE: bio_done and bio_caller_info belong to the caller, while
   57  * bio_driver_info belongs to the driver.
   58  *
   59  * bio_track is only non-NULL when an I/O is in progress.
   60  */
   61 struct bio {
   62         TAILQ_ENTRY(bio) bio_act;       /* driver queue when active */
   63         TAILQ_ENTRY(bio) link;
   64         struct bio_track *bio_track;    /* BIO tracking structure */
   65         struct disk     *bio_disk;
   66         struct bio      *bio_prev;      /* BIO stack */
   67         struct bio      *bio_next;      /* BIO stack / cached translations */
   68         struct buf      *bio_buf;       /* High-level buffer back-pointer. */
   69         biodone_t       *bio_done;      /* MPSAFE caller completion function */
   70         off_t           bio_offset;     /* Logical offset relative to device */
   71         void            *bio_driver_info;
   72         int             bio_flags;
   73         union {
   74                 void    *ptr;
   75                 off_t   offset;
   76                 int     index;
   77                 u_int32_t uvalue32;
   78                 struct buf *cluster_head;
   79                 struct bio *cluster_parent;
   80         } bio_caller_info1;
   81         union {
   82                 void    *ptr;
   83                 off_t   offset;
   84                 int     index;
   85                 struct buf *cluster_tail;
   86         } bio_caller_info2;
   87         union {
   88                 void    *ptr;
   89                 int     value;
   90                 long    lvalue;
   91                 struct  timeval tv;
   92         } bio_caller_info3;
   93 };
   94 
   95 /*
   96  * BIO flags, used for strategy/biodone/biodone_sync interactions.
   97  */
   98 #define BIO_SYNC        0x00000001
   99 #define BIO_WANT        0x20000000
  100 #define BIO_DONE        0x40000000
  101 
  102 void bio_start_transaction(struct bio *, struct bio_track *);
  103 
  104 #endif

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

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sys/sys/bio.h