Hi,
I've got a quick question on the blk_rq_map_sg() API usage.
In an efforts of implementing pass through support on FC transport
layer, the transport would call blk_rq_map_sg() API to map the pages
in the bio structure so that the LLD could DMA to/from the mapped
addresses - as specified in the section 2.2 of the ~/Documentation/
block/biodoc.txt.
To me, it seems like a right way to do..., could anyone comment on
this approach?
Also, I couldn't find symmetric counter-part for the API (i.e.,
blk_rq_unmap_sg() or similar).
Does this means that we don't need to unmap those addresses?
Thank you,
Seokmann
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