>> 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
> complete.
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?
Cheers,
Trond
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