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Btrfs needs some basic DIO changes that are kABI breakers.  Once these are accepted upstream they need to be pulled back so BTRFS can have direct IO support in RHEL6.

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

*** This bug has been marked as a duplicate of bug 593834 ***