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