qemu-img: check block status of backing file when converting.
When converting images, check the block status of its backing file chain to avoid needlessly reading zeros. Signed-off-by: NRen Kimura <rkx1209dev@gmail.com> Message-id: 1461773098-20356-1-git-send-email-rkx1209dev@gmail.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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