69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/*
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* Copyright (C) 2008 Oracle. 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/sched.h>
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#include <linux/slab.h>
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#include <linux/sort.h>
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#include "ctree.h"
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#include "ref-cache.h"
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#include "transaction.h"
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static struct rb_node *tree_insert(struct rb_root *root, u64 bytenr,
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struct rb_node *node)
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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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struct btrfs_leaf_ref *entry;
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while (*p) {
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parent = *p;
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entry = rb_entry(parent, struct btrfs_leaf_ref, rb_node);
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if (bytenr < entry->bytenr)
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p = &(*p)->rb_left;
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else if (bytenr > entry->bytenr)
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p = &(*p)->rb_right;
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else
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return parent;
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}
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entry = rb_entry(node, struct btrfs_leaf_ref, rb_node);
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rb_link_node(node, parent, p);
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rb_insert_color(node, root);
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return NULL;
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}
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static struct rb_node *tree_search(struct rb_root *root, u64 bytenr)
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{
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struct rb_node *n = root->rb_node;
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struct btrfs_leaf_ref *entry;
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while (n) {
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entry = rb_entry(n, struct btrfs_leaf_ref, rb_node);
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WARN_ON(!entry->in_tree);
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if (bytenr < entry->bytenr)
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n = n->rb_left;
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else if (bytenr > entry->bytenr)
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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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return NULL;
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}
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