Change sendfile() to use the new m_ext callback scheme for cleaning up after
[dragonfly.git] / sys / sys / sfbuf.h
... / ...
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1/*
2 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>. All rights reserved.
3 * Copyright (c) 1998 David Greenman. 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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $DragonFly: src/sys/sys/sfbuf.h,v 1.5 2004/07/30 21:56:17 dillon Exp $
27 */
28
29#ifndef _SFBUF_H_
30#define _SFBUF_H_
31
32struct sf_buf {
33 LIST_ENTRY(sf_buf) list_entry; /* hash chain of active buffers */
34 TAILQ_ENTRY(sf_buf) free_entry; /* list of free buffers */
35 struct vm_page *m; /* currently mapped page */
36 vm_offset_t kva; /* va of mapping */
37 int refcnt; /* usage of this mapping */
38 int flags; /* global SFBA flags */
39 cpumask_t cpumask; /* cpu mapping synchronization */
40 int aux1; /* auxillary counter TEMPORARY HACK */
41 int aux2; /* auxillary counter TEMPORARY HACK */
42};
43
44/*
45 * sf_buf_alloc() flags (not all are stored in sf->flags)
46 */
47#define SFBA_QUICK 0x0001 /* sync mapping to current cpu only */
48#define SFBA_ONFREEQ 0x0002 /* on the free queue (lazy move) */
49#define SFBA_PCATCH 0x0004 /* allow interruption */
50
51static __inline vm_offset_t
52sf_buf_kva(struct sf_buf *sf)
53{
54 return(sf->kva);
55}
56
57static __inline struct vm_page *
58sf_buf_page(struct sf_buf *sf)
59{
60 return(sf->m);
61}
62
63
64#if defined(_KERNEL)
65
66extern int nsfbufs;
67
68struct sf_buf *sf_buf_alloc(struct vm_page *, int flags);
69void sf_buf_free(struct sf_buf *);
70void sf_buf_ref(struct sf_buf *);
71
72#endif
73
74#endif