From 1a95588e8090a2ac6cab364e5a24be219f50710b Mon Sep 17 00:00:00 2001
From: Lukas Czerner <lczerner@redhat.com>
Date: Fri, 6 Aug 2021 11:58:17 +0200
Subject: [PATCH 41/46] libext2fs: remove augmented rbtree functionality
Content-Type: text/plain

Rbtree code was originally taken from linux kernel. This includes the
augmented rbtree functionality, however this was never intended to be
used and is not used still. Just remove it.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 lib/ext2fs/rbtree.c | 68 ---------------------------------------------
 lib/ext2fs/rbtree.h |  8 ------
 2 files changed, 76 deletions(-)

diff --git a/lib/ext2fs/rbtree.c b/lib/ext2fs/rbtree.c
index 5b92099d..74426fa6 100644
--- a/lib/ext2fs/rbtree.c
+++ b/lib/ext2fs/rbtree.c
@@ -280,74 +280,6 @@ void ext2fs_rb_erase(struct rb_node *node, struct rb_root *root)
 		__rb_erase_color(child, parent, root);
 }
 
-static void ext2fs_rb_augment_path(struct rb_node *node, rb_augment_f func, void *data)
-{
-	struct rb_node *parent;
-
-up:
-	func(node, data);
-	parent = ext2fs_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 ext2fs_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;
-
-	ext2fs_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 *ext2fs_rb_augment_erase_begin(struct rb_node *node)
-{
-	struct rb_node *deepest;
-
-	if (!node->rb_right && !node->rb_left)
-		deepest = ext2fs_rb_parent(node);
-	else if (!node->rb_right)
-		deepest = node->rb_left;
-	else if (!node->rb_left)
-		deepest = node->rb_right;
-	else {
-		deepest = ext2fs_rb_next(node);
-		if (deepest->rb_right)
-			deepest = deepest->rb_right;
-		else if (ext2fs_rb_parent(deepest) != node)
-			deepest = ext2fs_rb_parent(deepest);
-	}
-
-	return deepest;
-}
-
-/*
- * after removal, update the tree to account for the removed entry
- * and any rebalance damage.
- */
-void ext2fs_rb_augment_erase_end(struct rb_node *node, rb_augment_f func, void *data)
-{
-	if (node)
-		ext2fs_rb_augment_path(node, func, data);
-}
-
 /*
  * This function returns the first node (in sort order) of the tree.
  */
diff --git a/lib/ext2fs/rbtree.h b/lib/ext2fs/rbtree.h
index 9e806779..a4eb35ae 100644
--- a/lib/ext2fs/rbtree.h
+++ b/lib/ext2fs/rbtree.h
@@ -161,14 +161,6 @@ static inline void ext2fs_rb_clear_node(struct rb_node *node)
 extern void ext2fs_rb_insert_color(struct rb_node *, struct rb_root *);
 extern void ext2fs_rb_erase(struct rb_node *, struct rb_root *);
 
-typedef void (*rb_augment_f)(struct rb_node *node, void *data);
-
-extern void ext2fs_rb_augment_insert(struct rb_node *node,
-			      rb_augment_f func, void *data);
-extern struct rb_node *ext2fs_rb_augment_erase_begin(struct rb_node *node);
-extern void ext2fs_rb_augment_erase_end(struct rb_node *node,
-				 rb_augment_f func, void *data);
-
 /* Find logical next and previous nodes in a tree */
 extern struct rb_node *ext2fs_rb_next(struct rb_node *);
 extern struct rb_node *ext2fs_rb_prev(struct rb_node *);
-- 
2.35.1