tree 374c6af58fb08a000f09fa1e1966e4bd157731b9
parent 00db646d3fb3f5f62c2327abcf3630f4cc1075ba
author Qu Wenruo <quwenruo@cn.fujitsu.com> 1427706180 +0800
committer Chris Mason <clm@fb.com> 1433953503 -0700

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>