RCU caching regression in kernel v4.1+

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Hi Al,

Please could you take a look at the bugzilla entry in
https://bugzilla.kernel.org/show_bug.cgi?id=104911 ?

It describes a NFS caching regression that appears to be caused by
commit 766c4cbfacd8634d7580bac6a1b8456e63de3e84 ("namei:
d_is_negative() should be checked before ->d_seq validation").

Shouldn't that test for 'if (negative) return -ENOENT;' happen after
the call to d_revalidate() in lookup_fast()? If not, we can end up
caching negative dentries forever, AFAICS...

Cheers
  Trond
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