Add retry_request_cb in BlockDevOps to do device specific retry action. Backend's timer would be registered only when the backend is set 'retry' on errors and the device supports retry action. Signed-off-by: Jiahui Cen <cenjiahui(a)huawei.com> Signed-off-by: Ying Fang <fangying1(a)huawei.com>
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