nfsd: don't allow CLOSE to proceed until refcount on stateid drops
Once we remove client_mutex protection, it'll be possible to have an in-flight operation using an openstateid when a CLOSE call comes in. If that happens, we can't just put the sc_file reference and clear its pointer without risking an oops. Fix this by ensuring that v4.0 CLOSE operations wait for the refcount to drop before proceeding to do so. Signed-off-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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