From c6fc24549960f26910cd0c6e4b5f48f2f306b11d Mon Sep 17 00:00:00 2001
From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Mon, 30 Mar 2015 17:03:00 +0800
Subject: [PATCH] btrfs: delayed-ref: Use list to replace the ref_root in
 ref_head.

This patch replace the rbtree used in ref_head to list.
This has the following advantage:
1) Easier merge logic.
With the new list implement, we only need to care merging the tail
ref_node with the new ref_node.
And this can be done quite easy at insert time, no need to do a
indicated merge at run_delayed_refs().

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
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