Annotation of prex/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 */
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