[PATCH] Btrfs: remove rb_node field from the delayed ref node structure

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

After the last big change in the delayed references code that was needed
for the last qgroups rework, the red black tree node field of struct
btrfs_delayed_ref_node is no longer used, so just remove it, this helps
us save some memory (since struct rb_node is 24 bytes on x86_64) for
these structures.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
 fs/btrfs/delayed-ref.h | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 43f3629..a72fbe7 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -34,12 +34,6 @@
  * ref_head. Must clean this mess up later.
  */
 struct btrfs_delayed_ref_node {
-	/*
-	 * ref_head use rb tree, stored in ref_root->href.
-	 * indexed by bytenr
-	 */
-	struct rb_node rb_node;
-
 	/*data/tree ref use list, stored in ref_head->ref_list. */
 	struct list_head list;
 
-- 
2.7.0.rc3