1 files changed, 44 insertions, 4 deletions

diff --git a/lib/rbtree.c b/lib/rbtree.c
index e2aa3be29858..15e10b1afdd2 100644
--- a/lib/rbtree.c
+++ b/lib/rbtree.c
@@ -44,6 +44,11 @@ static void __rb_rotate_left(struct rb_node *node, struct rb_root *root)
         else
                 root->rb_node = right;
         rb_set_parent(node, right);
+
+        if (root->augment_cb) {
+                root->augment_cb(node);
+                root->augment_cb(right);
+        }
 }
 
 static void __rb_rotate_right(struct rb_node *node, struct rb_root *root)
@@ -67,12 +72,20 @@ static void __rb_rotate_right(struct rb_node *node, struct rb_root *root)
         else
                 root->rb_node = left;
         rb_set_parent(node, left);
+
+        if (root->augment_cb) {
+                root->augment_cb(node);
+                root->augment_cb(left);
+        }
 }
 
 void rb_insert_color(struct rb_node *node, struct rb_root *root)
 {
         struct rb_node *parent, *gparent;
 
+        if (root->augment_cb)
+                root->augment_cb(node);
+
         while ((parent = rb_parent(node)) && rb_is_red(parent))
         {
                 gparent = rb_parent(parent);
@@ -227,12 +240,15 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
         else
         {
                 struct rb_node *old = node, *left;
+                int old_parent_cb = 0;
+                int successor_parent_cb = 0;
 
                 node = node->rb_right;
                 while ((left = node->rb_left) != NULL)
                         node = left;
 
                 if (rb_parent(old)) {
+                        old_parent_cb = 1;
                         if (rb_parent(old)->rb_left == old)
                                 rb_parent(old)->rb_left = node;
                         else
@@ -247,8 +263,10 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
                 if (parent == old) {
                         parent = node;
                 } else {
+                        successor_parent_cb = 1;
                         if (child)
                                 rb_set_parent(child, parent);
+
                         parent->rb_left = child;
 
                         node->rb_right = old->rb_right;
@@ -259,6 +277,24 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
                 node->rb_left = old->rb_left;
                 rb_set_parent(old->rb_left, node);
 
+                if (root->augment_cb) {
+                        /*
+                         * Here, three different nodes can have new children.
+                         * The parent of the successor node that was selected
+                         * to replace the node to be erased.
+                         * The node that is getting erased and is now replaced
+                         * by its successor.
+                         * The parent of the node getting erased-replaced.
+                         */
+                        if (successor_parent_cb)
+                                root->augment_cb(parent);
+
+                        root->augment_cb(node);
+
+                        if (old_parent_cb)
+                                root->augment_cb(rb_parent(old));
+                }
+
                 goto color;
         }
 
@@ -267,15 +303,19 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
 
         if (child)
                 rb_set_parent(child, parent);
-        if (parent)
-        {
+
+        if (parent) {
                 if (parent->rb_left == node)
                         parent->rb_left = child;
                 else
                         parent->rb_right = child;
-        }
-        else
+
+                if (root->augment_cb)
+                        root->augment_cb(parent);
+
+        } else {
                 root->rb_node = child;
+        }
 
  color:
         if (color == RB_BLACK)