diff options
| -rw-r--r-- | lib/radix-tree.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c index 6900f7b..272ce81 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -405,6 +405,29 @@ static inline unsigned long radix_tree_maxindex(unsigned int height) return height_to_maxindex[height]; } +static inline unsigned long node_maxindex(struct radix_tree_node *node) +{ + return radix_tree_maxindex(node->path & RADIX_TREE_HEIGHT_MASK); +} + +static unsigned radix_tree_load_root(struct radix_tree_root *root, + struct radix_tree_node **nodep, unsigned long *maxindex) +{ + struct radix_tree_node *node = rcu_dereference_raw(root->rnode); + + *nodep = node; + + if (likely(radix_tree_is_indirect_ptr(node))) { + node = indirect_to_ptr(node); + *maxindex = node_maxindex(node); + return (node->path & RADIX_TREE_HEIGHT_MASK) * + RADIX_TREE_MAP_SHIFT; + } + + *maxindex = 0; + return 0; +} + /* * Extend a radix tree so it can store key @index. */ |