Modern SCSI hardware often uses 64-bit logical units (LUNs). The patch found at widens the type of lun_id_t to 64 bits, bumps CAM_VERSION, and begins exposing these to drivers that are marked as supporting extended LUNs. No behavior is changed except that peripheral with very long LUNs that didn't work before will start working. Binary compatibility with old code is also kept. There is, however, a chance that some 3rd party software might be unhappy about the type widening, so I'd appreciate any testing results. Barring any issues, I will commit this on Friday.
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