NFS: get module in idmap PipeFS notifier callback
This is bug fix. Notifier callback is called from SUNRPC module. So before dereferencing NFS module we have to make sure, that it's alive. Signed-off-by: NStanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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