[sheepdog] [PATCH v3 4/5] rbtree: remove unused augment functions

[Liu Yuan]

We are unlikely to use them in the future. So remove it.

Signed-off-by: Liu Yuan <namei.unix at gmail.com>
---
 include/rbtree.h |    8 -------
 lib/rbtree.c     |   68 ------------------------------------------------------
 2 files changed, 76 deletions(-)

diff --git a/include/rbtree.h b/include/rbtree.h
index b3b023e..c926cff 100644
--- a/include/rbtree.h
+++ b/include/rbtree.h
@@ -53,14 +53,6 @@ static inline void rb_init_node(struct rb_node *rb)
 void rb_insert_color(struct rb_node *, struct rb_root *);
 void rb_erase(struct rb_node *, struct rb_root *);
 
-typedef void (*rb_augment_f)(struct rb_node *node, void *data);
-
-void rb_augment_insert(struct rb_node *node,
-		rb_augment_f func, void *data);
-struct rb_node *rb_augment_erase_begin(struct rb_node *node);
-void rb_augment_erase_end(struct rb_node *node,
-		rb_augment_f func, void *data);
-
 /* Find logical next and previous nodes in a tree */
 struct rb_node *rb_next(const struct rb_node *);
 struct rb_node *rb_prev(const struct rb_node *);
diff --git a/lib/rbtree.c b/lib/rbtree.c
index 0db1054..1e54659 100644
--- a/lib/rbtree.c
+++ b/lib/rbtree.c
@@ -251,74 +251,6 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
 		__rb_erase_color(child, parent, root);
 }
 
-static void rb_augment_path(struct rb_node *node, rb_augment_f func, void *data)
-{
-	struct rb_node *parent;
-
-up:
-	func(node, data);
-	parent = rb_parent(node);
-	if (!parent)
-		return;
-
-	if (node == parent->rb_left && parent->rb_right)
-		func(parent->rb_right, data);
-	else if (parent->rb_left)
-		func(parent->rb_left, data);
-
-	node = parent;
-	goto up;
-}
-
-/*
- * after inserting @node into the tree, update the tree to account for
- * both the new entry and any damage done by rebalance
- */
-void rb_augment_insert(struct rb_node *node, rb_augment_f func, void *data)
-{
-	if (node->rb_left)
-		node = node->rb_left;
-	else if (node->rb_right)
-		node = node->rb_right;
-
-	rb_augment_path(node, func, data);
-}
-
-/*
- * before removing the node, find the deepest node on the rebalance path
- * that will still be there after @node gets removed
- */
-struct rb_node *rb_augment_erase_begin(struct rb_node *node)
-{
-	struct rb_node *deepest;
-
-	if (!node->rb_right && !node->rb_left)
-		deepest = rb_parent(node);
-	else if (!node->rb_right)
-		deepest = node->rb_left;
-	else if (!node->rb_left)
-		deepest = node->rb_right;
-	else {
-		deepest = rb_next(node);
-		if (deepest->rb_right)
-			deepest = deepest->rb_right;
-		else if (rb_parent(deepest) != node)
-			deepest = rb_parent(deepest);
-	}
-
-	return deepest;
-}
-
-/*
- * after removal, update the tree to account for the removed entry
- * and any rebalance damage.
- */
-void rb_augment_erase_end(struct rb_node *node, rb_augment_f func, void *data)
-{
-	if (node)
-		rb_augment_path(node, func, data);
-}
-
 /* This function returns the first node (in sort order) of the tree. */
 struct rb_node *rb_first(const struct rb_root *root)
 {
-- 
1.7.9.5