[XFS] Fix ABBA deadlock between i_mutex and iolock. Avoid calling
__blockdev_direct_IO for the DIO_OWN_LOCKING case for direct I/O reads since it drops and reacquires the i_mutex while holding the iolock and this violates the locking order. SGI-PV: 955696 SGI-Modid: xfs-linux-melb:xfs-kern:26898a Signed-off-by: NLachlan McIlroy <lachlan@sgi.com> Signed-off-by: NDavid Chatterton <chatz@sgi.com>
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