Description of problem: Need O_DIRECT support in translators to avoid page caching.
O_DIRECT support is present in all of the performance translators. Only enhancement required to support VM hosting better is that in write-behind queueing up writes of O_DIRECT flag too.
*** This bug has been marked as a duplicate of bug 857673 ***
CHANGE: http://review.gluster.org/4206 (protocol/client: add an option to filter O_DIRECT flag in open) merged in master by Vijay Bellur (vbellur)