nfs: add a nfs_ilookup helper
This helper will allow to find an existing NFS inode by the file handle and fattr. Signed-off-by: NPeng Tao <tao.peng@primarydata.com> [hch: split from a larger patch] Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>
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