1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2018 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_RADIX_TREE_H_ 32 #define _LINUX_RADIX_TREE_H_ 33 34 #include <linux/types.h> 35 36 #define RADIX_TREE_MAP_SHIFT 6 37 #define RADIX_TREE_MAP_SIZE (1UL << RADIX_TREE_MAP_SHIFT) 38 #define RADIX_TREE_MAP_MASK (RADIX_TREE_MAP_SIZE - 1UL) 39 #define RADIX_TREE_MAX_HEIGHT \ 40 howmany(sizeof(long) * NBBY, RADIX_TREE_MAP_SHIFT) 41 42 #define RADIX_TREE_ENTRY_MASK 3UL 43 #define RADIX_TREE_EXCEPTIONAL_ENTRY 2UL 44 #define RADIX_TREE_EXCEPTIONAL_SHIFT 2 45 46 struct radix_tree_node { 47 void *slots[RADIX_TREE_MAP_SIZE]; 48 int count; 49 }; 50 51 struct radix_tree_root { 52 struct radix_tree_node *rnode; 53 gfp_t gfp_mask; 54 int height; 55 }; 56 57 struct radix_tree_iter { 58 unsigned long index; 59 }; 60 61 #define RADIX_TREE_INIT(mask) \ 62 { .rnode = NULL, .gfp_mask = mask, .height = 0 }; 63 #define INIT_RADIX_TREE(root, mask) \ 64 { (root)->rnode = NULL; (root)->gfp_mask = mask; (root)->height = 0; } 65 #define RADIX_TREE(name, mask) \ 66 struct radix_tree_root name = RADIX_TREE_INIT(mask) 67 68 #define radix_tree_for_each_slot(slot, root, iter, start) \ 69 for ((iter)->index = (start); \ 70 radix_tree_iter_find(root, iter, &(slot)); (iter)->index++) 71 72 static inline int 73 radix_tree_exception(void *arg) 74 { 75 return ((uintptr_t)arg & RADIX_TREE_ENTRY_MASK); 76 } 77 78 void *radix_tree_lookup(struct radix_tree_root *, unsigned long); 79 void *radix_tree_delete(struct radix_tree_root *, unsigned long); 80 int radix_tree_insert(struct radix_tree_root *, unsigned long, void *); 81 bool radix_tree_iter_find(struct radix_tree_root *, struct radix_tree_iter *, void ***); 82 void radix_tree_iter_delete(struct radix_tree_root *, struct radix_tree_iter *, void **); 83 84 #endif /* _LINUX_RADIX_TREE_H_ */ 85