May I state my user's point of view:
I know one applications that uses O_DIRECT, and it is subtly broken on
BTRFS. I know no applications that use O_DIRECT and are not broken.
(Really more statistics would help here, probably some exist that
provably work.) According to developers making O_DIRECT work on BTRFS is
difficult if not impossible. Isn't it time to disable O_DIRECT like ZFS
does AFAIU? Data safety is certainly more important than performance
gain it may or may not give some applications.
--
With Best Regards,
Marat Khalili
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