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Lidong Chen authored
When the buffer is zero, blk_co_pwrite_zeroes is more effective than blk_co_pwritev with BDRV_REQ_WRITE_COMPRESSED. This patch can reduce the time for converting qcow2 images with lots of zero data. Signed-off-by: Lidong Chen <lidongchen@tencent.com> Message-id: 1493261907-18734-1-git-send-email-lidongchen@tencent.com Signed-off-by: Max Reitz <mreitz@redhat.com>
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