The OSD standard requires support for bidirectional commands (write and get
obj attribute at the same command for example). The SAM-3 defines that in
order to execute a SCSI command the caller should supply an input an output
buffer. It seems that in the current Linux SCSI implementation the API
accept only one buffer, input our output buffer depends on the
data_direction flag.
Is there some work going on trying to implement bidirectional support?
Is it sound reasonable to extend the scatter-gather structure to include
data direction flag and by that bypass the interface problem and allow
support for bidirectional commands?
Thanks,
- Liran
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