[wip] Fsync pdev in vdev cp. #565
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This is to ensure data written to the vdev(and fiannly to the pdev), is actually written to disk, even pdev uses buffer io. Signed-off-by: Xiaoxi Chen <xiaoxchen@ebay.com>
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This is to ensure data written to the vdev(and fiannly to the pdev), is actually written to disk, even pdev uses buffer io.