On a related hardware note:

FWIW, most ATA controllers have scatter/gather tables that terminate themselves by a bit in the final s/g entry. The 90% case needs to know the last scatterlist entry, at the end of the s/g walk.

So however this all gets worked out, please make sure not to unduly punish libata controllers with an expensive sg_last() inside a loop, or something like that. :)

        Jeff




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