radix-tree.h revision 289624 
1/* $FreeBSD: head/sys/ofed/include/linux/radix-tree.h 289624 2015-10-20 11:40:04Z hselasky $ */
2/*-
3 * Copyright (c) 2010 Isilon Systems, Inc.
4 * Copyright (c) 2010 iX Systems, Inc.
5 * Copyright (c) 2010 Panasas, Inc.
6 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice unmodified, this list of conditions, and the following
14 *    disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef	_LINUX_RADIX_TREE_H_
32#define	_LINUX_RADIX_TREE_H_
33
34#define	RADIX_TREE_MAP_SHIFT	6
35#define	RADIX_TREE_MAP_SIZE	(1 << RADIX_TREE_MAP_SHIFT)
36#define	RADIX_TREE_MAP_MASK	(RADIX_TREE_MAP_SIZE - 1)
37#define	RADIX_TREE_MAX_HEIGHT						\
38	    DIV_ROUND_UP((sizeof(long) * NBBY), RADIX_TREE_MAP_SHIFT)
39
40struct radix_tree_node {
41	void		*slots[RADIX_TREE_MAP_SIZE];
42	int		count;
43};
44
45struct radix_tree_root {
46	struct radix_tree_node	*rnode;
47	gfp_t			gfp_mask;
48	int			height;
49};
50
51#define	RADIX_TREE_INIT(mask)						\
52	    { .rnode = NULL, .gfp_mask = mask, .height = 0 };
53#define	INIT_RADIX_TREE(root, mask)					\
54	    { (root)->rnode = NULL; (root)->gfp_mask = mask; (root)->height = 0; }
55#define	RADIX_TREE(name, mask)						\
56	    struct radix_tree_root name = RADIX_TREE_INIT(mask)
57
58void	*radix_tree_lookup(struct radix_tree_root *, unsigned long);
59void	*radix_tree_delete(struct radix_tree_root *, unsigned long);
60int	radix_tree_insert(struct radix_tree_root *, unsigned long, void *);
61
62#endif	/* _LINUX_RADIX_TREE_H_ */
63