nfs: don't create zero-length requests
NFS doesn't expect requests with wb_bytes set to zero and may make unexpected decisions about how to handle that request at the page IO layer. Skip request creation if we won't have any wb_bytes in the request. Signed-off-by: NBenjamin Coddington <bcodding@redhat.com> Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com> Reviewed-by: NWeston Andros Adamson <dros@primarydata.com> Cc: stable@vger.kernel.org Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
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