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