xref: /titanic_41/usr/src/uts/common/sys/fbuf.h (revision b59b3655028aeb11832ad679eb5c2577c2b75235)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
24  *
25  * Copyright (c) 1997-1998 by Sun Microsystems, Inc.
26  * All rights reserved.
27  */
28 
29 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
30 /*	  All Rights Reserved  	*/
31 
32 
33 #ifndef _SYS_FBUF_H
34 #define	_SYS_FBUF_H
35 
36 #include <sys/vnode.h>
37 
38 #ifdef	__cplusplus
39 extern "C" {
40 #endif
41 
42 /*
43  * A struct fbuf is used to get a mapping to part of a file using the
44  * segkmap facilities.  After you get a mapping, you can fbrelse() it
45  * (giving a seg code to pass back to segmap_release), you can fbwrite()
46  * it (causes a synchronous write back using the file mapping information),
47  * or you can fbiwrite it (causing indirect synchronous write back to
48  * the block number given without using the file mapping information).
49  */
50 
51 struct fbuf {
52 	caddr_t	fb_addr;
53 	uint_t	fb_count;
54 };
55 
56 extern int fbread(struct vnode *, offset_t, uint_t, enum seg_rw,
57     struct fbuf **);
58 extern void fbzero(struct vnode *, offset_t, uint_t, struct fbuf **);
59 extern int fbwrite(struct fbuf *);
60 extern int fbdwrite(struct fbuf *);
61 extern int fbiwrite(struct fbuf *, struct vnode *, daddr_t bn, int bsize);
62 extern void fbrelse(struct fbuf *, enum seg_rw);
63 
64 #ifdef	__cplusplus
65 }
66 #endif
67 
68 #endif	/* _SYS_FBUF_H */
69