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/11.1/sys/sys/bio.h 300207 2016-05-19 14:08:36Z ken $
   36  */
   37 
   38 #ifndef _SYS_BIO_H_
   39 #define _SYS_BIO_H_
   40 
   41 #include <sys/queue.h>
   42 #include <sys/disk_zone.h>
   43 
   44 /* bio_cmd */
   45 #define BIO_READ        0x01    /* Read I/O data */
   46 #define BIO_WRITE       0x02    /* Write I/O data */
   47 #define BIO_DELETE      0x03    /* TRIM or free blocks, i.e. mark as unused */
   48 #define BIO_GETATTR     0x04    /* Get GEOM attributes of object */
   49 #define BIO_FLUSH       0x05    /* Commit outstanding I/O now */
   50 #define BIO_CMD0        0x06    /* Available for local hacks */
   51 #define BIO_CMD1        0x07    /* Available for local hacks */
   52 #define BIO_CMD2        0x08    /* Available for local hacks */
   53 #define BIO_ZONE        0x09    /* Zone command */
   54 
   55 /* bio_flags */
   56 #define BIO_ERROR       0x01    /* An error occurred processing this bio. */
   57 #define BIO_DONE        0x02    /* This bio is finished. */
   58 #define BIO_ONQUEUE     0x04    /* This bio is in a queue & not yet taken. */
   59 /*
   60  * This bio must be executed after all previous bios in the queue have been
   61  * executed, and before any successive bios can be executed.
   62  */
   63 #define BIO_ORDERED     0x08
   64 #define BIO_UNMAPPED    0x10
   65 #define BIO_TRANSIENT_MAPPING   0x20
   66 #define BIO_VLIST       0x40
   67 
   68 #ifdef _KERNEL
   69 struct disk;
   70 struct bio;
   71 struct vm_map;
   72 
   73 /* Empty classifier tag, to prevent further classification. */
   74 #define BIO_NOTCLASSIFIED               (void *)(~0UL)
   75 
   76 typedef void bio_task_t(void *);
   77 
   78 /*
   79  * The bio structure describes an I/O operation in the kernel.
   80  */
   81 struct bio {
   82         uint16_t bio_cmd;               /* I/O operation. */
   83         uint16_t bio_flags;             /* General flags. */
   84         uint16_t bio_cflags;            /* Private use by the consumer. */
   85         uint16_t bio_pflags;            /* Private use by the provider. */
   86         struct cdev *bio_dev;           /* Device to do I/O on. */
   87         struct disk *bio_disk;          /* Valid below geom_disk.c only */
   88         off_t   bio_offset;             /* Offset into file. */
   89         long    bio_bcount;             /* Valid bytes in buffer. */
   90         caddr_t bio_data;               /* Memory, superblocks, indirect etc. */
   91         struct vm_page **bio_ma;        /* Or unmapped. */
   92         int     bio_ma_offset;          /* Offset in the first page of bio_ma. */
   93         int     bio_ma_n;               /* Number of pages in bio_ma. */
   94         int     bio_error;              /* Errno for BIO_ERROR. */
   95         long    bio_resid;              /* Remaining I/O in bytes. */
   96         void    (*bio_done)(struct bio *);
   97         void    *bio_driver1;           /* Private use by the provider. */
   98         void    *bio_driver2;           /* Private use by the provider. */
   99         void    *bio_caller1;           /* Private use by the consumer. */
  100         void    *bio_caller2;           /* Private use by the consumer. */
  101         TAILQ_ENTRY(bio) bio_queue;     /* Disksort queue. */
  102         const char *bio_attribute;      /* Attribute for BIO_[GS]ETATTR */
  103         struct  disk_zone_args bio_zone;/* Used for BIO_ZONE */
  104         struct g_consumer *bio_from;    /* GEOM linkage */
  105         struct g_provider *bio_to;      /* GEOM linkage */
  106         off_t   bio_length;             /* Like bio_bcount */
  107         off_t   bio_completed;          /* Inverse of bio_resid */
  108         u_int   bio_children;           /* Number of spawned bios */
  109         u_int   bio_inbed;              /* Children safely home by now */
  110         struct bio *bio_parent;         /* Pointer to parent */
  111         struct bintime bio_t0;          /* Time request started */
  112 
  113         bio_task_t *bio_task;           /* Task_queue handler */
  114         void    *bio_task_arg;          /* Argument to above */
  115 
  116         void    *bio_classifier1;       /* Classifier tag. */
  117         void    *bio_classifier2;       /* Classifier tag. */
  118 
  119 #ifdef DIAGNOSTIC
  120         void    *_bio_caller1;
  121         void    *_bio_caller2;
  122         uint8_t _bio_cflags;
  123 #endif
  124 
  125         /* XXX: these go away when bio chaining is introduced */
  126         daddr_t bio_pblkno;               /* physical block number */
  127 };
  128 
  129 struct uio;
  130 struct devstat;
  131 
  132 struct bio_queue_head {
  133         TAILQ_HEAD(bio_queue, bio) queue;
  134         off_t last_offset;
  135         struct  bio *insert_point;
  136 };
  137 
  138 extern struct vm_map *bio_transient_map;
  139 extern int bio_transient_maxcnt;
  140 
  141 void biodone(struct bio *bp);
  142 void biofinish(struct bio *bp, struct devstat *stat, int error);
  143 int biowait(struct bio *bp, const char *wchan);
  144 
  145 void bioq_disksort(struct bio_queue_head *ap, struct bio *bp);
  146 struct bio *bioq_first(struct bio_queue_head *head);
  147 struct bio *bioq_takefirst(struct bio_queue_head *head);
  148 void bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error);
  149 void bioq_init(struct bio_queue_head *head);
  150 void bioq_insert_head(struct bio_queue_head *head, struct bio *bp);
  151 void bioq_insert_tail(struct bio_queue_head *head, struct bio *bp);
  152 void bioq_remove(struct bio_queue_head *head, struct bio *bp);
  153 
  154 void bio_taskqueue(struct bio *bp, bio_task_t *fund, void *arg);
  155 
  156 int     physio(struct cdev *dev, struct uio *uio, int ioflag);
  157 #define physread physio
  158 #define physwrite physio
  159 
  160 #endif /* _KERNEL */
  161 
  162 #endif /* !_SYS_BIO_H_ */

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