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6b839ff47b
extensible arrays implementation. While at it add some more comments explaining the current radix_tree_insert() function and make sure to clean the root node when the radix tree reaches the maximum height. This can happen if the index passed is too big when the tree is empty. The radix_tree_store() function is basically a copy of the radix_tree_insert() function with some added functionality. The radix_tree_store() function is local to FreeBSD and does not yet exist in Linux. Reviewed by: kib MFC after: 1 week Sponsored by: Mellanox Technologies
85 lines
3.1 KiB
C
85 lines
3.1 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) 2013-2018 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 (1UL << RADIX_TREE_MAP_SHIFT)
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#define RADIX_TREE_MAP_MASK (RADIX_TREE_MAP_SIZE - 1UL)
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#define RADIX_TREE_MAX_HEIGHT \
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howmany(sizeof(long) * NBBY, RADIX_TREE_MAP_SHIFT)
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#define RADIX_TREE_ENTRY_MASK 3UL
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#define RADIX_TREE_EXCEPTIONAL_ENTRY 2UL
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#define RADIX_TREE_EXCEPTIONAL_SHIFT 2
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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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struct radix_tree_iter {
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unsigned long index;
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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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#define radix_tree_for_each_slot(slot, root, iter, start) \
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for ((iter)->index = (start); \
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radix_tree_iter_find(root, iter, &(slot)); (iter)->index++)
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static inline int
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radix_tree_exception(void *arg)
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{
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return ((uintptr_t)arg & RADIX_TREE_ENTRY_MASK);
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}
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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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int radix_tree_store(struct radix_tree_root *, unsigned long, void **);
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bool radix_tree_iter_find(struct radix_tree_root *, struct radix_tree_iter *, void ***);
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void radix_tree_iter_delete(struct radix_tree_root *, struct radix_tree_iter *, void **);
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#endif /* _LINUX_RADIX_TREE_H_ */
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