65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_RADIX_TREE_H_
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#define _LINUX_RADIX_TREE_H_
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#include <linux/types.h>
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#define RADIX_TREE_MAP_SHIFT 6
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#define RADIX_TREE_MAP_SIZE (1 << RADIX_TREE_MAP_SHIFT)
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#define RADIX_TREE_MAP_MASK (RADIX_TREE_MAP_SIZE - 1)
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#define RADIX_TREE_MAX_HEIGHT \
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DIV_ROUND_UP((sizeof(long) * NBBY), RADIX_TREE_MAP_SHIFT)
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struct radix_tree_node {
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void *slots[RADIX_TREE_MAP_SIZE];
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int count;
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};
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struct radix_tree_root {
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struct radix_tree_node *rnode;
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gfp_t gfp_mask;
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int height;
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};
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#define RADIX_TREE_INIT(mask) \
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{ .rnode = NULL, .gfp_mask = mask, .height = 0 };
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#define INIT_RADIX_TREE(root, mask) \
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{ (root)->rnode = NULL; (root)->gfp_mask = mask; (root)->height = 0; }
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#define RADIX_TREE(name, mask) \
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struct radix_tree_root name = RADIX_TREE_INIT(mask)
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void *radix_tree_lookup(struct radix_tree_root *, unsigned long);
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void *radix_tree_delete(struct radix_tree_root *, unsigned long);
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int radix_tree_insert(struct radix_tree_root *, unsigned long, void *);
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#endif /* _LINUX_RADIX_TREE_H_ */
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