1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5219820Sjeff * All rights reserved. 6219820Sjeff * 7219820Sjeff * Redistribution and use in source and binary forms, with or without 8219820Sjeff * modification, are permitted provided that the following conditions 9219820Sjeff * are met: 10219820Sjeff * 1. Redistributions of source code must retain the above copyright 11219820Sjeff * notice unmodified, this list of conditions, and the following 12219820Sjeff * disclaimer. 13219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 14219820Sjeff * notice, this list of conditions and the following disclaimer in the 15219820Sjeff * documentation and/or other materials provided with the distribution. 16219820Sjeff * 17219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27219820Sjeff */ 28219820Sjeff 29219820Sjeff#ifndef _LINUX_RADIX_TREE_H_ 30219820Sjeff#define _LINUX_RADIX_TREE_H_ 31219820Sjeff 32219820Sjeff#define RADIX_TREE_MAP_SHIFT 6 33219820Sjeff#define RADIX_TREE_MAP_SIZE (1 << RADIX_TREE_MAP_SHIFT) 34219820Sjeff#define RADIX_TREE_MAP_MASK (RADIX_TREE_MAP_SIZE - 1) 35219820Sjeff#define RADIX_TREE_MAX_HEIGHT \ 36219820Sjeff DIV_ROUND_UP((sizeof(long) * NBBY), RADIX_TREE_MAP_SHIFT) 37219820Sjeff 38219820Sjeffstruct radix_tree_node { 39219820Sjeff void *slots[RADIX_TREE_MAP_SIZE]; 40219820Sjeff int count; 41219820Sjeff}; 42219820Sjeff 43219820Sjeffstruct radix_tree_root { 44219820Sjeff struct radix_tree_node *rnode; 45219820Sjeff gfp_t gfp_mask; 46219820Sjeff int height; 47219820Sjeff}; 48219820Sjeff 49219820Sjeff#define RADIX_TREE_INIT(mask) \ 50219820Sjeff { .rnode = NULL, .gfp_mask = mask, .height = 0 }; 51219820Sjeff#define INIT_RADIX_TREE(root, mask) \ 52219820Sjeff { (root)->rnode = NULL; (root)->gfp_mask = mask; (root)->height = 0; } 53219820Sjeff#define RADIX_TREE(name, mask) \ 54219820Sjeff struct radix_tree_root name = RADIX_TREE_INIT(mask) 55219820Sjeff 56219820Sjeffvoid *radix_tree_lookup(struct radix_tree_root *, unsigned long); 57219820Sjeffvoid *radix_tree_delete(struct radix_tree_root *, unsigned long); 58219820Sjeffint radix_tree_insert(struct radix_tree_root *, unsigned long, void *); 59219820Sjeff 60219820Sjeff#endif /* _LINUX_RADIX_TREE_H_ */ 61