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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)buf.h       8.9 (Berkeley) 3/30/95
   37  * $FreeBSD: stable/12/sys/sys/bio.h 335066 2018-06-13 16:48:07Z imp $
   38  */
   39 
   40 #ifndef _SYS_BIO_H_
   41 #define _SYS_BIO_H_
   42 
   43 #include <sys/queue.h>
   44 #include <sys/disk_zone.h>
   45 
   46 /* bio_cmd */
   47 #define BIO_READ        0x01    /* Read I/O data */
   48 #define BIO_WRITE       0x02    /* Write I/O data */
   49 #define BIO_DELETE      0x03    /* TRIM or free blocks, i.e. mark as unused */
   50 #define BIO_GETATTR     0x04    /* Get GEOM attributes of object */
   51 #define BIO_FLUSH       0x05    /* Commit outstanding I/O now */
   52 #define BIO_CMD0        0x06    /* Available for local hacks */
   53 #define BIO_CMD1        0x07    /* Available for local hacks */
   54 #define BIO_CMD2        0x08    /* Available for local hacks */
   55 #define BIO_ZONE        0x09    /* Zone command */
   56 
   57 /* bio_flags */
   58 #define BIO_ERROR       0x01    /* An error occurred processing this bio. */
   59 #define BIO_DONE        0x02    /* This bio is finished. */
   60 #define BIO_ONQUEUE     0x04    /* This bio is in a queue & not yet taken. */
   61 /*
   62  * This bio must be executed after all previous bios in the queue have been
   63  * executed, and before any successive bios can be executed.
   64  */
   65 #define BIO_ORDERED     0x08
   66 #define BIO_UNMAPPED    0x10
   67 #define BIO_TRANSIENT_MAPPING   0x20
   68 #define BIO_VLIST       0x40
   69 
   70 #ifdef _KERNEL
   71 struct disk;
   72 struct bio;
   73 struct vm_map;
   74 
   75 /* Empty classifier tag, to prevent further classification. */
   76 #define BIO_NOTCLASSIFIED               (void *)(~0UL)
   77 
   78 typedef void bio_task_t(void *);
   79 
   80 /*
   81  * The bio structure describes an I/O operation in the kernel.
   82  */
   83 struct bio {
   84         uint16_t bio_cmd;               /* I/O operation. */
   85         uint16_t bio_flags;             /* General flags. */
   86         uint16_t bio_cflags;            /* Private use by the consumer. */
   87         uint16_t bio_pflags;            /* Private use by the provider. */
   88         struct cdev *bio_dev;           /* Device to do I/O on. */
   89         struct disk *bio_disk;          /* Valid below geom_disk.c only */
   90         off_t   bio_offset;             /* Offset into file. */
   91         long    bio_bcount;             /* Valid bytes in buffer. */
   92         caddr_t bio_data;               /* Memory, superblocks, indirect etc. */
   93         struct vm_page **bio_ma;        /* Or unmapped. */
   94         int     bio_ma_offset;          /* Offset in the first page of bio_ma. */
   95         int     bio_ma_n;               /* Number of pages in bio_ma. */
   96         int     bio_error;              /* Errno for BIO_ERROR. */
   97         long    bio_resid;              /* Remaining I/O in bytes. */
   98         void    (*bio_done)(struct bio *);
   99         void    *bio_driver1;           /* Private use by the provider. */
  100         void    *bio_driver2;           /* Private use by the provider. */
  101         void    *bio_caller1;           /* Private use by the consumer. */
  102         void    *bio_caller2;           /* Private use by the consumer. */
  103         TAILQ_ENTRY(bio) bio_queue;     /* Disksort queue. */
  104         const char *bio_attribute;      /* Attribute for BIO_[GS]ETATTR */
  105         struct  disk_zone_args bio_zone;/* Used for BIO_ZONE */
  106         struct g_consumer *bio_from;    /* GEOM linkage */
  107         struct g_provider *bio_to;      /* GEOM linkage */
  108         off_t   bio_length;             /* Like bio_bcount */
  109         off_t   bio_completed;          /* Inverse of bio_resid */
  110         u_int   bio_children;           /* Number of spawned bios */
  111         u_int   bio_inbed;              /* Children safely home by now */
  112         struct bio *bio_parent;         /* Pointer to parent */
  113         struct bintime bio_t0;          /* Time request started */
  114 
  115         bio_task_t *bio_task;           /* Task_queue handler */
  116         void    *bio_task_arg;          /* Argument to above */
  117 
  118         void    *bio_classifier1;       /* Classifier tag. */
  119         void    *bio_classifier2;       /* Classifier tag. */
  120 
  121 #ifdef DIAGNOSTIC
  122         void    *_bio_caller1;
  123         void    *_bio_caller2;
  124         uint8_t _bio_cflags;
  125 #endif
  126 #if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
  127         struct buf *bio_track_bp;       /* Parent buf for tracking */
  128 #endif
  129 
  130         /* XXX: these go away when bio chaining is introduced */
  131         daddr_t bio_pblkno;               /* physical block number */
  132 };
  133 
  134 struct uio;
  135 struct devstat;
  136 
  137 struct bio_queue_head {
  138         TAILQ_HEAD(bio_queue, bio) queue;
  139         off_t last_offset;
  140         struct  bio *insert_point;
  141         int total;
  142         int batched;
  143 };
  144 
  145 extern struct vm_map *bio_transient_map;
  146 extern int bio_transient_maxcnt;
  147 
  148 void biodone(struct bio *bp);
  149 void biofinish(struct bio *bp, struct devstat *stat, int error);
  150 int biowait(struct bio *bp, const char *wchan);
  151 
  152 #if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
  153 void biotrack_buf(struct bio *bp, const char *location);
  154 
  155 static __inline void
  156 biotrack(struct bio *bp, const char *location)
  157 {
  158 
  159         if (bp->bio_track_bp != NULL)
  160                 biotrack_buf(bp, location);
  161 }
  162 #else
  163 static __inline void
  164 biotrack(struct bio *bp __unused, const char *location __unused)
  165 {
  166 }
  167 #endif
  168 
  169 void bioq_disksort(struct bio_queue_head *ap, struct bio *bp);
  170 struct bio *bioq_first(struct bio_queue_head *head);
  171 struct bio *bioq_takefirst(struct bio_queue_head *head);
  172 void bioq_flush(struct bio_queue_head *head, struct devstat *stp, int error);
  173 void bioq_init(struct bio_queue_head *head);
  174 void bioq_insert_head(struct bio_queue_head *head, struct bio *bp);
  175 void bioq_insert_tail(struct bio_queue_head *head, struct bio *bp);
  176 void bioq_remove(struct bio_queue_head *head, struct bio *bp);
  177 
  178 int     physio(struct cdev *dev, struct uio *uio, int ioflag);
  179 #define physread physio
  180 #define physwrite physio
  181 
  182 #endif /* _KERNEL */
  183 
  184 #endif /* !_SYS_BIO_H_ */

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