lvm2: enable option o_direct
lvm2: enable option o_direct

During some lvm operations, e.g, create many volumes, we notice
a quite big degradation in performance with o_direct disabled,
if enabled the performance get much better, so, here we should
enable this option.

Signed-off-by: Wenlin Kang <59c32e08742fdc9bf0bd9f1ea9645eb2df186229@windriver.com>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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