Christoph Hellwig wrote:
>
> > 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.
I can use this DMA_BIDIRECTIONAL flag. But I still do need somthing like a
scatterlist to overcome the fact that we have only one pointer for data
buffer instead of two, one for data out and one for data in.
- Liran
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