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: releng/10.1/sys/sys/bio.h 248654 2013-03-23 16:55:07Z will $
   36  */
   37 
   38 #ifndef _SYS_BIO_H_
   39 #define _SYS_BIO_H_
   40 
   41 #include <sys/queue.h>
   42 
   43 /* bio_cmd */
   44 #define BIO_READ        0x01    /* Read I/O data */
   45 #define BIO_WRITE       0x02    /* Write I/O data */
   46 #define BIO_DELETE      0x04    /* TRIM or free blocks, i.e. mark as unused */
   47 #define BIO_GETATTR     0x08    /* Get GEOM attributes of object */
   48 #define BIO_FLUSH       0x10    /* Commit outstanding I/O now */
   49 #define BIO_CMD0        0x20    /* Available for local hacks */
   50 #define BIO_CMD1        0x40    /* Available for local hacks */
   51 #define BIO_CMD2        0x80    /* Available for local hacks */
   52 
   53 /* bio_flags */
   54 #define BIO_ERROR       0x01    /* An error occurred processing this bio. */
   55 #define BIO_DONE        0x02    /* This bio is finished. */
   56 #define BIO_ONQUEUE     0x04    /* This bio is in a queue & not yet taken. */
   57 /*
   58  * This bio must be executed after all previous bios in the queue have been
   59  * executed, and before any successive bios can be executed.
   60  */
   61 #define BIO_ORDERED     0x08
   62 #define BIO_UNMAPPED    0x10
   63 #define BIO_TRANSIENT_MAPPING   0x20
   64 
   65 #ifdef _KERNEL
   66 struct disk;
   67 struct bio;
   68 struct vm_map;
   69 
   70 /* Empty classifier tag, to prevent further classification. */
   71 #define BIO_NOTCLASSIFIED               (void *)(~0UL)
   72 
   73 typedef void bio_task_t(void *);
   74 
   75 /*
   76  * The bio structure describes an I/O operation in the kernel.
   77  */
   78 struct bio {
   79         uint8_t bio_cmd;                /* I/O operation. */
   80         uint8_t bio_flags;              /* General flags. */
   81         uint8_t bio_cflags;             /* Private use by the consumer. */
   82         uint8_t bio_pflags;             /* Private use by the provider. */
   83         struct cdev *bio_dev;           /* Device to do I/O on. */
   84         struct disk *bio_disk;          /* Valid below geom_disk.c only */
   85         off_t   bio_offset;             /* Offset into file. */
   86         long    bio_bcount;             /* Valid bytes in buffer. */
   87         caddr_t bio_data;               /* Memory, superblocks, indirect etc. */
   88         struct vm_page **bio_ma;        /* Or unmapped. */
   89         int     bio_ma_offset;          /* Offset in the first page of bio_ma. */
   90         int     bio_ma_n;               /* Number of pages in bio_ma. */
   91         int     bio_error;              /* Errno for BIO_ERROR. */
   92         long    bio_resid;              /* Remaining I/O in bytes. */
   93         void    (*bio_done)(struct bio *);
   94         void    *bio_driver1;           /* Private use by the provider. */
   95         void    *bio_driver2;           /* Private use by the provider. */
   96         void    *bio_caller1;           /* Private use by the consumer. */
   97         void    *bio_caller2;           /* Private use by the consumer. */
   98         TAILQ_ENTRY(bio) bio_queue;     /* Disksort queue. */
   99         const char *bio_attribute;      /* Attribute for BIO_[GS]ETATTR */
  100         struct g_consumer *bio_from;    /* GEOM linkage */
  101         struct g_provider *bio_to;      /* GEOM linkage */
  102         off_t   bio_length;             /* Like bio_bcount */
  103         off_t   bio_completed;          /* Inverse of bio_resid */
  104         u_int   bio_children;           /* Number of spawned bios */
  105         u_int   bio_inbed;              /* Children safely home by now */
  106         struct bio *bio_parent;         /* Pointer to parent */
  107         struct bintime bio_t0;          /* Time request started */
  108 
  109         bio_task_t *bio_task;           /* Task_queue handler */
  110         void    *bio_task_arg;          /* Argument to above */
  111 
  112         void    *bio_classifier1;       /* Classifier tag. */
  113         void    *bio_classifier2;       /* Classifier tag. */
  114 
  115 #ifdef DIAGNOSTIC
  116         void    *_bio_caller1;
  117         void    *_bio_caller2;
  118         uint8_t _bio_cflags;
  119 #endif
  120 
  121         /* XXX: these go away when bio chaining is introduced */
  122         daddr_t bio_pblkno;               /* physical block number */
  123 };
  124 
  125 struct uio;
  126 struct devstat;
  127 
  128 struct bio_queue_head {
  129         TAILQ_HEAD(bio_queue, bio) queue;
  130         off_t last_offset;
  131         struct  bio *insert_point;
  132 };
  133 
  134 extern struct vm_map *bio_transient_map;
  135 extern int bio_transient_maxcnt;
  136 
  137 void biodone(struct bio *bp);
  138 void biofinish(struct bio *bp, struct devstat *stat, int error);
  139 int biowait(struct bio *bp, const char *wchan);
  140 
  141 void bioq_disksort(struct bio_queue_head *ap, struct bio *bp);
  142 struct bio *bioq_first(struct bio_queue_head *head);
  143 struct bio *bioq_takefirst(struct bio_queue_head *head);
  144 void bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error);
  145 void bioq_init(struct bio_queue_head *head);
  146 void bioq_insert_head(struct bio_queue_head *head, struct bio *bp);
  147 void bioq_insert_tail(struct bio_queue_head *head, struct bio *bp);
  148 void bioq_remove(struct bio_queue_head *head, struct bio *bp);
  149 
  150 void bio_taskqueue(struct bio *bp, bio_task_t *fund, void *arg);
  151 
  152 int     physio(struct cdev *dev, struct uio *uio, int ioflag);
  153 #define physread physio
  154 #define physwrite physio
  155 
  156 #endif /* _KERNEL */
  157 
  158 #endif /* !_SYS_BIO_H_ */

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