>> Note that in doing so, we do not want to invalidate any reads
>> or writes that may have been already scheduled. The existing
>> mapping still would need to hang around long enough to permit
>> them to complete.
> With the mechanism I described above, that would just work.
> The fault path would do lock_page, thus waiting for the IO to
NFS writes do not hold the page lock until completion. How would you
expect to be able to coalesce writes to the same page if they did?
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