[PATCHv4 10/10] blk-integrity: improved sg segment mapping

[Martin K. Petersen]

Keith,

> Make the integrity mapping more like data mapping, blk_rq_map_sg. Use
> the request to validate the segment count, and update the callers so
> they don't have to.

Looks OK except for the phys vs. integrity snafu.

It has been a constant source of problems that we haven't been able to
have a common mapping function that works for both data and metadata.
blk_rq_map_sg() and blk_rq_map_integrity_sg() always seem to get out of
sync in peculiar ways.

Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering