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SubjectRe: O_DIRECT fails in some kernel and FS
> If an application is multithreaded and is doing mmap and direct I/O
> from different threads without doing its own synchronization, then it
> is broken, there is no ordering guarantee provided by the kernel as
> to what happens first.

Providing we don't allow asynchronous I/O with O_DIRECT once asynchronous
I/O is merged.

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