storvsc: force discovery of LUNs that may have been removed.
The host asks the guest to scan when a LUN is removed or added. The only way a guest can identify the removed LUN is when an I/O is attempted on a removed LUN - the SRB status code indicates that the LUN is invalid. We currently handle this SRB status and remove the device. Rather than waiting for an I/O to remove the device, force the discovery of LUNs that may have been removed prior to discovering LUNs that may have been added. Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com> Reviewed-by: NLong Li <longli@microsoft.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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