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   1 /*-
   2  * Copyright (c) 2005-2007, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #ifndef _SYS_BUF_H_
  31 #define _SYS_BUF_H_
  33 #include <sys/types.h>
  34 #include <sys/cdefs.h>
  35 #include <sys/list.h>
  37 /*
  38  * Buffer header
  39  */
  40 struct buf {
  41         struct list     b_link;         /* link to block list */
  42         int             b_flags;        /* see defines below */
dev_t           b_dev;          /* device number */
  44         int             b_blkno;        /* block # on device */
mutex_t         b_lock;         /* lock for access */
  46         char            *b_data;        /* pointer to data buffer */
  47 };
  49 /*
  50  * These flags are kept in b_flags.
  51  */
  52 #define B_BUSY          0x00000001      /* I/O in progress. */
  53 #define B_DELWRI        0x00000002      /* delay I/O until buffer reused. */
  54 #define B_INVAL         0x00000004      /* does not contain valid info. */
  55 #define B_READ          0x00000008      /* read buffer. */
  56 #define B_DONE          0x00000010      /* I/O completed. */
__BEGIN_DECLS
  59 struct buf *getblk(dev_t, int);
  60 int     bread(dev_t, int, struct buf **);
  61 int     bwrite(struct buf *);
  62 void    bdwrite(struct buf *);
  63 void    binval(dev_t);
  64 void    brelse(struct buf *);
  65 void    bflush(struct buf *);
  66 void    bio_sync(void);
  67 void    bio_init(void);
__END_DECLS
  70 #endif /* !_SYS_BUF_H_ */