So instead of adding a parameter, we can make scsi_execute_async()
decide for itself based on the SCSI command, with read/write I/Os
taking the lowest priority.
This seems like a bad idea, I can come up with a number of cases where
the priority of a request would better be optimized by a higher level
subsystem, rather than a simple prioritization based on the command type.
The original suggestion to provide both head and tail insertion options
seems like the obvious solution, short of a full priority queuing system.
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