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

     /*
      * Copyright (c) 1982, 1986, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)buf.h       8.9 (Berkeley) 3/30/95
     * $FreeBSD: releng/5.0/sys/sys/bio.h 104700 2002-10-09 07:11:03Z phk $
     */
    
    #ifndef _SYS_BIO_H_
    #define _SYS_BIO_H_
    
    #include <sys/queue.h>
    
    struct bio;
    
    struct iodone_chain {
            long    ic_prev_flags;
            void    (*ic_prev_iodone)(struct bio *);
            void    *ic_prev_iodone_chain;
            struct {
                    long    ia_long;
                    void    *ia_ptr;
            }       ic_args[5];
    };
    
    /*
     * The bio structure describes an I/O operation in the kernel.
     */
    struct bio {
            u_int   bio_cmd;                /* I/O operation. */
            dev_t   bio_dev;                /* Device to do I/O on. */
            daddr_t bio_blkno;              /* Underlying physical block number. */
            off_t   bio_offset;             /* Offset into file. */
            long    bio_bcount;             /* Valid bytes in buffer. */
            caddr_t bio_data;               /* Memory, superblocks, indirect etc. */
            u_int   bio_flags;              /* BIO_ flags. */
            int     bio_error;              /* Errno for BIO_ERROR. */
            long    bio_resid;              /* Remaining I/0 in bytes. */
            void    (*bio_done)(struct bio *);
            void    *bio_driver1;           /* Private use by the callee. */
            void    *bio_driver2;           /* Private use by the callee. */
            void    *bio_caller1;           /* Private use by the caller. */
            void    *bio_caller2;           /* Private use by the caller. */
            TAILQ_ENTRY(bio) bio_queue;     /* Disksort queue. */
            const char *bio_attribute;      /* Attribute for BIO_[GS]ETATTR */
            struct g_consumer *bio_from;    /* GEOM linkage */
            struct g_provider *bio_to;      /* GEOM linkage */
            off_t   bio_length;             /* Like bio_bcount */
            off_t   bio_completed;          /* Inverse of bio_resid */
            u_int   bio_children;           /* Number of spawned bios */
    
            /* XXX: these go away when bio chaining is introduced */
            daddr_t bio_pblkno;               /* physical block number */
            struct  iodone_chain *bio_done_chain;
            struct bio *bio_linkage;
    };
    
    /* bio_cmd */
    #define BIO_READ        0x00000001
    #define BIO_WRITE       0x00000002
    #define BIO_DELETE      0x00000004
    #define BIO_GETATTR     0x00000008
    #define BIO_SETATTR     0x00000010
    #define BIO_CMD1        0x40000000      /* Available for local hacks */
    #define BIO_CMD2        0x80000000      /* Available for local hacks */
    
   /* bio_flags */
   #define BIO_ERROR       0x00000001
   #define BIO_DONE        0x00000004
   #define BIO_FLAG2       0x40000000      /* Available for local hacks */
   #define BIO_FLAG1       0x80000000      /* Available for local hacks */
   
   #ifdef _KERNEL
   
   struct uio;
   struct devstat;
   
   struct bio_queue_head {
           TAILQ_HEAD(bio_queue, bio) queue;
           daddr_t last_pblkno;
           struct  bio *insert_point;
           struct  bio *switch_point;
           int busy;
   };
   
   static __inline void bioq_insert_tail(struct bio_queue_head *head,
                                         struct bio *bp);
   static __inline struct bio *bioq_first(struct bio_queue_head *head);
   
   static __inline void
   bioq_insert_tail(struct bio_queue_head *head, struct bio *bp)
   {
   
           TAILQ_INSERT_TAIL(&head->queue, bp, bio_queue);
   }
   
   static __inline struct bio *
   bioq_first(struct bio_queue_head *head)
   {
   
           return (TAILQ_FIRST(&head->queue));
   }
   
   void biodone(struct bio *bp);
   void biofinish(struct bio *bp, struct devstat *stat, int error);
   int biowait(struct bio *bp, const char *wchan);
   void bioq_disksort(struct bio_queue_head *ap, struct bio *bp);
   #define bioqdisksort(foo, bar) bioq_disksort(foo, bar)
   void bioq_init(struct bio_queue_head *head);
   void bioq_remove(struct bio_queue_head *head, struct bio *bp);
   
   int     physio(dev_t dev, struct uio *uio, int ioflag);
   #define physread physio
   #define physwrite physio
   
   #endif /* _KERNEL */
   
   #endif /* !_SYS_BIO_H_ */

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