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Annotation of prex-old/include/sys/buf.h, Revision 1.1

1.1     ! nbrk        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:  */
        !            29:
        !            30: #ifndef _SYS_BUF_H
        !            31: #define _SYS_BUF_H
        !            32:
        !            33: #include <sys/types.h>
        !            34: #include <sys/cdefs.h>
        !            35: #include <sys/list.h>
        !            36:
        !            37: /*
        !            38:  * Buffer header
        !            39:  */
        !            40: struct buf {
        !            41:        struct list     b_link;         /* link to block list */
        !            42:        int             b_flags;        /* see defines below */
        !            43:        dev_t           b_dev;          /* device number */
        !            44:        int             b_blkno;        /* block # on device */
        !            45:        mutex_t         b_lock;         /* lock for access */
        !            46:        char            *b_data;        /* pointer to data buffer */
        !            47: };
        !            48:
        !            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. */
        !            57:
        !            58: __BEGIN_DECLS
        !            59: struct buf *getblk(dev_t dev, int blkno);
        !            60: int    bread(dev_t dev, int blkno, struct buf **bpp);
        !            61: int    bwrite(struct buf *bp);
        !            62: void   bdwrite(struct buf *bp);
        !            63: void   binval(dev_t dev);
        !            64: void   brelse(struct buf *);
        !            65: void   bflush(struct buf *);
        !            66: void   bio_sync(void);
        !            67: void   bio_init(void);
        !            68: __END_DECLS
        !            69:
        !            70: #endif /* !_SYS_BUF_H */