[SCSI] export device_busy for sdev
If you mutiple devices connect to a host, we might be interested in have an intensive I/O workload on one disk, and notice starvation on others. This give the user more hint about current infight io for scsi device. Signed-off-by: NJack Wang <jinpu.wang@profitbricks.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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