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/bio.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)buf.h       8.9 (Berkeley) 3/30/95
   35  * $FreeBSD$
   36  */
   37 
   38 #ifndef _SYS_BIO_H_
   39 #define _SYS_BIO_H_
   40 
   41 #include <sys/queue.h>
   42 
   43 struct disk;
   44 struct bio;
   45 
   46 typedef void bio_task_t(void *);
   47 
   48 /*
   49  * The bio structure describes an I/O operation in the kernel.
   50  */
   51 struct bio {
   52         uint8_t bio_cmd;                /* I/O operation. */
   53         uint8_t bio_flags;              /* General flags. */
   54         uint8_t bio_cflags;             /* Private use by the consumer. */
   55         uint8_t bio_pflags;             /* Private use by the provider. */
   56         struct cdev *bio_dev;           /* Device to do I/O on. */
   57         struct disk *bio_disk;          /* Valid below geom_disk.c only */
   58         off_t   bio_offset;             /* Offset into file. */
   59         long    bio_bcount;             /* Valid bytes in buffer. */
   60         caddr_t bio_data;               /* Memory, superblocks, indirect etc. */
   61         int     bio_error;              /* Errno for BIO_ERROR. */
   62         long    bio_resid;              /* Remaining I/0 in bytes. */
   63         void    (*bio_done)(struct bio *);
   64         void    *bio_driver1;           /* Private use by the provider. */
   65         void    *bio_driver2;           /* Private use by the provider. */
   66         void    *bio_caller1;           /* Private use by the consumer. */
   67         void    *bio_caller2;           /* Private use by the consumer. */
   68         TAILQ_ENTRY(bio) bio_queue;     /* Disksort queue. */
   69         const char *bio_attribute;      /* Attribute for BIO_[GS]ETATTR */
   70         struct g_consumer *bio_from;    /* GEOM linkage */
   71         struct g_provider *bio_to;      /* GEOM linkage */
   72         off_t   bio_length;             /* Like bio_bcount */
   73         off_t   bio_completed;          /* Inverse of bio_resid */
   74         u_int   bio_children;           /* Number of spawned bios */
   75         u_int   bio_inbed;              /* Children safely home by now */
   76         struct bio *bio_parent;         /* Pointer to parent */
   77         struct bintime bio_t0;          /* Time request started */
   78 
   79         bio_task_t *bio_task;           /* Task_queue handler */
   80         void    *bio_task_arg;          /* Argument to above */
   81 
   82         /* XXX: these go away when bio chaining is introduced */
   83         daddr_t bio_pblkno;               /* physical block number */
   84 };
   85 
   86 /* bio_cmd */
   87 #define BIO_READ        0x01
   88 #define BIO_WRITE       0x02
   89 #define BIO_DELETE      0x04
   90 #define BIO_GETATTR     0x08
   91 #define BIO_CMD0        0x20    /* Available for local hacks */
   92 #define BIO_CMD1        0x40    /* Available for local hacks */
   93 #define BIO_CMD2        0x80    /* Available for local hacks */
   94 
   95 /* bio_flags */
   96 #define BIO_ERROR       0x01
   97 #define BIO_DONE        0x02
   98 #define BIO_ONQUEUE     0x04
   99 
  100 #ifdef _KERNEL
  101 
  102 struct uio;
  103 struct devstat;
  104 
  105 struct bio_queue_head {
  106         TAILQ_HEAD(bio_queue, bio) queue;
  107         off_t last_offset;
  108         struct  bio *insert_point;
  109         struct  bio *switch_point;
  110 };
  111 
  112 void biodone(struct bio *bp);
  113 void biofinish(struct bio *bp, struct devstat *stat, int error);
  114 int biowait(struct bio *bp, const char *wchan);
  115 
  116 void bioq_disksort(struct bio_queue_head *ap, struct bio *bp);
  117 struct bio *bioq_first(struct bio_queue_head *head);
  118 void bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error);
  119 void bioq_init(struct bio_queue_head *head);
  120 void bioq_insert_head(struct bio_queue_head *head, struct bio *bp);
  121 void bioq_insert_tail(struct bio_queue_head *head, struct bio *bp);
  122 void bioq_remove(struct bio_queue_head *head, struct bio *bp);
  123 
  124 void bio_taskqueue(struct bio *bp, bio_task_t *fund, void *arg);
  125 
  126 int     physio(struct cdev *dev, struct uio *uio, int ioflag);
  127 #define physread physio
  128 #define physwrite physio
  129 
  130 #endif /* _KERNEL */
  131 
  132 #endif /* !_SYS_BIO_H_ */

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