On Tue, Nov 18, 2003 at 07:41:05PM +0200, Liran Schour wrote:
> 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?
I haven't heard about such work beeing done.
> 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?
Why do you need the flag in the scatterlist? We already have a dma_direction
enum in the scsi_cmnd that's pased to the dma mapping routines, it may
be DMA_BIDRECTIONAL although that's currently not used by any code.
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