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SubjectRe: fsync on large files
> For concurrent writes, it may be entirely acceptable to completely _drop_
> the write semaphore at well-defined places and retry, but that's going to
> be a per-filesystem thing: the VFS layer is going to basically grab the
> semaphore and default to complete atomicity. That way it's up to the
> low-level filesystem to handle concurrency, if the filesystem writer is
> 100% sure he knows what he is doing.

Ok. That provides a back door for the "and I do know what I am doing" people.
That makes a lot of sense then

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