bc621e545b
This is needed for incoming extent-cache infrastructure. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Marek Behún <marek.behun@nic.cz>
84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
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* Copyright (C) 2014 Facebook. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/errno.h>
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#include "rbtree-utils.h"
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int rb_insert(struct rb_root *root, struct rb_node *node,
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rb_compare_nodes comp)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent = NULL;
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int ret;
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while(*p) {
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parent = *p;
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ret = comp(parent, node);
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if (ret < 0)
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p = &(*p)->rb_left;
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else if (ret > 0)
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p = &(*p)->rb_right;
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else
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return -EEXIST;
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}
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rb_link_node(node, parent, p);
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rb_insert_color(node, root);
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return 0;
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}
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struct rb_node *rb_search(struct rb_root *root, void *key, rb_compare_keys comp,
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struct rb_node **next_ret)
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{
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struct rb_node *n = root->rb_node;
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struct rb_node *parent = NULL;
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int ret = 0;
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while(n) {
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parent = n;
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ret = comp(n, key);
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if (ret < 0)
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n = n->rb_left;
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else if (ret > 0)
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n = n->rb_right;
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else
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return n;
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}
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if (!next_ret)
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return NULL;
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if (parent && ret > 0)
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parent = rb_next(parent);
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*next_ret = parent;
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return NULL;
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}
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void rb_free_nodes(struct rb_root *root, rb_free_node free_node)
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{
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struct rb_node *node;
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while ((node = rb_first(root))) {
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rb_erase(node, root);
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free_node(node);
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}
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}
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