Hello, I tried to extend USB storage for the passthrough of Opal security commands, and some adapters are clearly "not perfect". I would need to introduce a new quirks flag to turn it off. Seems that we are already out of quirks flags on 32bit for usb storage - in usb_usual.h the last entry in mainline is US_FLAG(SENSE_AFTER_SYNC, 0x80000000) Adding a new flag will work for 64-bit systems but not for platforms with 32-bit unsigned long like i686. How do we allow new flag definitions? Struct us_data fflags can be made 64bit (defined in drivers/usb/storage/usb.h), but the major problem is that these are transferred through the generic driver_info field defined in linux/mod_devicetable.h as unsigned long). Making this 64bit is IMO an extensive API change (if even possible). I guess this is not the way to go. Could USB maintainers please help to advise what is the correct solution? I am not familiar with the USB driver model here and I see no easy way how it can be solved by a trivial static allocation inside the USB storage driver. Someone will need a new quirks flag in the future anyway... :) Thanks, Milan
