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While testing linux-2.6.0-test2-mm4 I noticed two things:

- O_DIRECT doesn't work, at least in ext3, with block size different
from filesystem's blocksize. (It doesn't work with 512 bs, at least).
This works in 2.6.0-test2, from 512 to 4096.

- vmstat doesn't show bi/bo for O_DIRECT's disk access.
Tested with filesystem's bs alignment.
This works in 2.6.0-test2.
(This one can be a feature, not a bug. But I really don't know)

Just to let you know! :)

If I can help with something feel free to ask. I tried to review -mm4
but it's too big for me so I can't point where the "problem" is...
Anyway, I suspect the AIO stuff ;)

Have fun,

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