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H A Dnfs.cef503a84 Fri Feb 17 16:39:01 GMT 2017 Peter Lieven <pl@kamp.de> block/nfs: try to avoid the bounce buffer in pwritev

if the passed qiov contains exactly one iov we can
pass the buffer directly.

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-id: 1487349541-10201-3-git-send-email-pl@kamp.de
Signed-off-by: Jeff Cody <jcody@redhat.com>