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btrfs: delayed-ref: Use list to replace the ref_root in ref_head.

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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>
This commit is contained in:
Qu Wenruo 2015-03-30 17:03:00 +08:00 • committed by Chris Mason
commit c6fc245499
5 changed files with 114 additions and 123 deletions
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