liubo 0647d6bd16 Btrfs: cleanup for unused ref cache stuff
As ref cache has been removed from btrfs, there is no user on
its lock and its check.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
2012-10-01 15:19:17 -04:00
..
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