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/*-

 * Copyright (c) 2005-2007, Kohsuke Ohtani

 * All rights reserved.

 *

 * 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. Neither the name of the author nor the names of any co-contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

 */

#ifndef _SYS_BUF_H_

#define _SYS_BUF_H_

#include <sys/types.h>

#include <sys/cdefs.h>

#include <sys/list.h>

/*

 * Buffer header

 */

struct buf {

        struct list        b_link;                /* link to block list */

        int                b_flags;        /* see defines below */

        dev_t                b_dev;                /* device number */

        int                b_blkno;        /* block # on device */

        mutex_t                b_lock;                /* lock for access */

        char                *b_data;        /* pointer to data buffer */

};

/*

 * These flags are kept in b_flags.

 */

#define        B_BUSY                0x00000001        /* I/O in progress. */

#define        B_DELWRI        0x00000002        /* delay I/O until buffer reused. */

#define        B_INVAL                0x00000004        /* does not contain valid info. */

#define        B_READ                0x00000008        /* read buffer. */

#define        B_DONE                0x00000010        /* I/O completed. */

__BEGIN_DECLS

struct buf *getblk(dev_t, int);

int        bread(dev_t, int, struct buf **);

int        bwrite(struct buf *);

void        bdwrite(struct buf *);

void        binval(dev_t);

void        brelse(struct buf *);

void        bflush(struct buf *);

void        bio_sync(void);

void        bio_init(void);

__END_DECLS

#endif /* !_SYS_BUF_H_ */