block/nfs: convert to preadv / pwritev
Signed-off-by: NPeter Lieven <pl@kamp.de> Reviewed-by: NJeff Cody <jcody@redhat.com> Message-id: 1487349541-10201-2-git-send-email-pl@kamp.de Signed-off-by: NJeff Cody <jcody@redhat.com>
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