Annotation of prex/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 */
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