NFS: Fix the locking in nfs4_callback_getattr
The delegation is protected by RCU now, so we need to replace the nfsi->rwsem protection with an rcu protected section. Reported-by: NFred Isaman <iisaman@netapp.com> Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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