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From: Ren Kimura <rkx1209dev@gmail.com>
Date: Wed, 13 Apr 2016 22:24:06 +0900
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Subject: [Qemu-devel] [PATCH 0/1] qemu-img: check block status of backing
 file when converting.
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To: kwolf@redhat.com
Cc: qemu-block@nongnu.org, qemu-devel@nongnu.org

When converting images, check the block status of it's backing file chain to avoid needlessly reading zeros.