diff options
Diffstat (limited to 'lib/radix-tree.c')
| -rw-r--r-- | lib/radix-tree.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c index 272ce810d29b..f13ddbba8ace 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -432,7 +432,7 @@ static unsigned radix_tree_load_root(struct radix_tree_root *root, * Extend a radix tree so it can store key @index. */ static int radix_tree_extend(struct radix_tree_root *root, - unsigned long index, unsigned order) + unsigned long index) { struct radix_tree_node *node; struct radix_tree_node *slot; @@ -444,7 +444,7 @@ static int radix_tree_extend(struct radix_tree_root *root, while (index > radix_tree_maxindex(height)) height++; - if ((root->rnode == NULL) && (order == 0)) { + if (root->rnode == NULL) { root->height = height; goto out; } @@ -467,7 +467,7 @@ static int radix_tree_extend(struct radix_tree_root *root, node->count = 1; node->parent = NULL; slot = root->rnode; - if (radix_tree_is_indirect_ptr(slot) && newheight > 1) { + if (radix_tree_is_indirect_ptr(slot)) { slot = indirect_to_ptr(slot); slot->parent = node; slot = ptr_to_indirect(slot); @@ -478,7 +478,7 @@ static int radix_tree_extend(struct radix_tree_root *root, root->height = newheight; } while (height > root->height); out: - return 0; + return height * RADIX_TREE_MAP_SHIFT; } /** @@ -503,20 +503,26 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index, void ***slotp) { struct radix_tree_node *node = NULL, *slot; + unsigned long maxindex; unsigned int height, shift, offset; - int error; + unsigned long max = index | ((1UL << order) - 1); + + shift = radix_tree_load_root(root, &slot, &maxindex); /* Make sure the tree is high enough. */ - if (index > radix_tree_maxindex(root->height)) { - error = radix_tree_extend(root, index, order); - if (error) + if (max > maxindex) { + int error = radix_tree_extend(root, max); + if (error < 0) return error; + shift = error; + slot = root->rnode; + if (order == shift) { + shift += RADIX_TREE_MAP_SHIFT; + root->height++; + } } - slot = root->rnode; - height = root->height; - shift = height * RADIX_TREE_MAP_SHIFT; offset = 0; /* uninitialised var warning */ while (shift > order) { |