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SubjectBIO usage questions

I have few questions on usage of "bio" in 2.5.X.

1) It is acceptable to use "bio" instead of "kio" for doing RAW IO
and direct IO ? Currently, "kio" are getting converted to "bio"
anywhy. why not use "bio" directly ?

I am planning to do this. But I was wondering what are the issues

2) I don't see how to wait for a "bio" to complete. I don't see any
wait_queue in bio structure. How can I wait for bio to complete ?

Please let me know.


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