1/*-
2 * Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD$
26 */
27
28#ifndef __LINUX_SHRINKER_H__
29#define	__LINUX_SHRINKER_H__
30
31#include <sys/queue.h>
32
33struct shrink_control {
34	unsigned long	nr_to_scan;
35	unsigned long	nr_scanned;
36};
37
38struct shrinker {
39	unsigned long		(*count_objects)(struct shrinker *, struct shrink_control *);
40	unsigned long		(*scan_objects)(struct shrinker *, struct shrink_control *);
41	int			seeks;
42	long			batch;
43	TAILQ_ENTRY(shrinker)	next;
44};
45
46#define	SHRINK_STOP	(~0UL)
47
48#define	DEFAULT_SEEKS	2
49
50int	linuxkpi_register_shrinker(struct shrinker *s);
51void	linuxkpi_unregister_shrinker(struct shrinker *s);
52
53#define	register_shrinker(s)	linuxkpi_register_shrinker(s)
54#define	unregister_shrinker(s)	linuxkpi_unregister_shrinker(s)
55
56#endif	/* __LINUX_SHRINKER_H__ */
57