[BUG] commit "namei: d_is_negative() should be checked before ->d_seq validation" breaks ceph-fuse

[Yan, Zheng]

Hi, Al

I found that commit 766c4cbfac "namei: d_is_negative() should be checked before ->d_seq validationâ  breaks ceph-fuse. After that commit,  lookup_fast can return -ENOENT before calling d_revalidate(). This breaks remote filesystems which allows creating/deleting files from multiple machines. 

Regards
Yan, Zheng--
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