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Annotation of prex-old/include/sys/buf.h, Revision 1.1.1.1

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 */