scoutos / prex-0.9.0 / include / sys / buf.h @ 03e9c04a
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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_ */ |