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eb60ceac CM |
1 | /* |
2 | * Copyright (C) 2001 Momchil Velikov | |
3 | * Portions Copyright (C) 2001 Christoph Hellwig | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License as | |
7 | * published by the Free Software Foundation; either version 2, or (at | |
8 | * your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | #ifndef _LINUX_RADIX_TREE_H | |
20 | #define _LINUX_RADIX_TREE_H | |
21 | ||
22 | #define RADIX_TREE_MAX_TAGS 2 | |
23 | ||
24 | /* root tags are stored in gfp_mask, shifted by __GFP_BITS_SHIFT */ | |
25 | struct radix_tree_root { | |
26 | unsigned int height; | |
27 | gfp_t gfp_mask; | |
28 | struct radix_tree_node *rnode; | |
29 | }; | |
30 | ||
31 | #define RADIX_TREE_INIT(mask) { \ | |
32 | .height = 0, \ | |
33 | .gfp_mask = (mask), \ | |
34 | .rnode = NULL, \ | |
35 | } | |
36 | ||
37 | #define RADIX_TREE(name, mask) \ | |
38 | struct radix_tree_root name = RADIX_TREE_INIT(mask) | |
39 | ||
40 | #define INIT_RADIX_TREE(root, mask) \ | |
41 | do { \ | |
42 | (root)->height = 0; \ | |
43 | (root)->gfp_mask = (mask); \ | |
44 | (root)->rnode = NULL; \ | |
45 | } while (0) | |
46 | ||
47 | int radix_tree_insert(struct radix_tree_root *, unsigned long, void *); | |
48 | void *radix_tree_lookup(struct radix_tree_root *, unsigned long); | |
49 | void **radix_tree_lookup_slot(struct radix_tree_root *, unsigned long); | |
50 | void *radix_tree_delete(struct radix_tree_root *, unsigned long); | |
51 | unsigned int | |
52 | radix_tree_gang_lookup(struct radix_tree_root *root, void **results, | |
53 | unsigned long first_index, unsigned int max_items); | |
54 | int radix_tree_preload(gfp_t gfp_mask); | |
55 | void radix_tree_init(void); | |
56 | void *radix_tree_tag_set(struct radix_tree_root *root, | |
57 | unsigned long index, unsigned int tag); | |
58 | void *radix_tree_tag_clear(struct radix_tree_root *root, | |
59 | unsigned long index, unsigned int tag); | |
60 | int radix_tree_tag_get(struct radix_tree_root *root, | |
61 | unsigned long index, unsigned int tag); | |
62 | unsigned int | |
63 | radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results, | |
64 | unsigned long first_index, unsigned int max_items, | |
65 | unsigned int tag); | |
66 | int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag); | |
67 | ||
68 | static inline void radix_tree_preload_end(void) | |
69 | { | |
70 | preempt_enable(); | |
71 | } | |
72 | ||
73 | #endif /* _LINUX_RADIX_TREE_H */ |