On 07/05/2014 11:41 AM, Christoph Hellwig wrote:
On Fri, Jul 04, 2014 at 04:12:22PM +0200, Hannes Reinecke wrote:
So what would be set in the upper 48 bits for those drivers? We receive
the LUN over the wire to start with.
None. All these devices are physically incapable of receiving or sending
LUNs more that a byte wide.
So what problems does this patch fix then?
The intention is twofold:
1) Isolate from any fallout due to the 64bit LUN changes. By
introducing accessors we are guaranteed that the drivers will only
ever see LUN numbers they are expecting.
2) Using accessors allows us to eventually change the ->lun field to
'struct scsi_lun', and call 'scsilun_to_int' only for display
purposes. This will address the objection by Bart for
ib_srp, but applies to other drivers as well.
Cheers,
Hannes
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Dr. Hannes Reinecke zSeries & Storage
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