block: flush backing_hd in the right place
The backing device is only modified from bdrv_commit. So instead of flushing it every time bdrv_flush is called for the front-end device only flush it after we're written data to it in bdrv_commit. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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