Why must NFS access metadata in synchronous mode?

[Xin Zhao]

Until kernel 2.6.16, I think NFS still access metadata synchronously,
which may impact performance significantly. Several years ago, paper
"metadata update performance in file systems" already suggested using
asynchronous mode in metadata access.

I am curious why NFS does not adopt this suggestion? Can someone explain this?

Thanks!

Xin
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