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由 Stefan Hajnoczi 提交于
Now that op blockers are in use, we can ensure that no other sources are generating I/O on a BlockDriverState. Therefore it is possible to drain requests for a single BDS. Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Message-id: 1413889440-32577-7-git-send-email-stefanha@redhat.com
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