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SubjectRe: [patch] sys_sync livelock fix
Daniel Phillips wrote:
>
> What's the theory behind writing the data both before and after the commit?

see fsync_dev(). It starts I/O against existing dirty data, then
does various fs-level syncy things which can produce more dirty
data - this is where ext3 runs its commit, via brilliant reverse
engineering of its calling context :-(. It then again starts I/O
against new dirty data then waits on it again. And then again.

There's quite a lot of overkill there. But that's OK, as long
as it terminates sometime.

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