map gendisk (or blockdev) -> scsi_device

[Edward Falk <efalk@xxxxxxxxxx>]

Hi all; what's the proper way to get the scsi_device structure from a 
gendisk structure?  sd.c uses pointers through scsi_disk, but that 
structure is private to sd.c.  Will I need to add an access function in 
sd.c or something?

-ed falk, efalk@xxxxxxxxxx

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