block: Introduce a new API bdrv_co_no_copy_on_readv()
In some cases, we need to disable copy-on-read, and just read the data. Signed-off-by: NWen Congyang <wency@cn.fujitsu.com> Message-id: 1441682913-14320-2-git-send-email-wency@cn.fujitsu.com Signed-off-by: NJeff Cody <jcody@redhat.com>
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