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>
parent
00db646d
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