Fam Zheng 53ec73e264 block: Use bdrv_drain to replace uncessary bdrv_drain_all
There callers work on a single BlockDriverState subtree, where using
bdrv_drain() is more accurate.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-07-07 14:27:14 +01:00
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