2 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>. All rights reserved.
3 * Copyright (c) 1998 David Greenman. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $DragonFly: src/sys/sys/sfbuf.h,v 1.9 2006/05/20 02:42:13 dillon Exp $
33 #include <sys/types.h>
36 #include <sys/queue.h>
39 #include <cpu/lwbuf.h>
41 #ifndef _SYS_REFCOUNT_H
42 #include <sys/refcount.h>
45 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
46 #error "This file should not be included by userland programs."
50 struct lwbuf *lwbuf; /* lightweight buffer */
51 u_int ref; /* ref count */
52 struct lwbuf lwbuf_cache;
55 #define sf_buf_kva(sf) (lwbuf_kva((sf)->lwbuf))
56 #define sf_buf_page(sf) (lwbuf_page((sf)->lwbuf))
61 struct sf_buf *sf_buf_alloc(struct vm_page *);
62 void sf_buf_ref(void *);
63 int sf_buf_free(void *);