O_DIRECT, fdatasync_area, mwrite

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Linus Torvalds:
> I suspect that this is about a few hundred lines of code (and a lot of
> testing). And you can emulate O_DIRECT behavior with it, along with
> splice (only for page-cache entities, though), and a lot of other
> off-by-one uses.
( http://lwn.net/2002/0516/a/lt-async.php3 )

I have often read this message and wondered why no one has implemented it yet. We would love to have such clean features instead of O_DIRECT. At this very moment it's a bit hard for us to do this(given a prerequisites learning curve amongst other factors.) We may at some point do it and I'd love to contribute. What _are_ the issues with it, and is there a technical reason it hasn't been implemented yet by anybody?

Further, is O_DIRECT to raw partition also unclean?

Thanks.

Reza.
--
Reza Roboubi
Chief Technical Officer
http://www.EarthDetails.com
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