[PATCH 0/12] Chaining sg lists for bio IO commands v4

Hi,

Sorry to spam the list so quickly again, but v3 had a critical
bug that needs fixing. Changes since v3:

- Addressed Andrews review comments (thanks Andrew!)

- sg_next() grew a silly bug right before posting, where it would
  pass back the chain entry instead of the next one. Thanks to
  Benny Halevy for spotting that.

I didn't include the big drivers portion of the patch since it
hasn't changed, so grab that from the v3 posting.


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