[dm-devel] remove REQ_OP_WRITE_SAME v2

[Martin K. Petersen]

Christoph,

> Now that we are using REQ_OP_WRITE_ZEROES for all zeroing needs in the
> kernel there is very little use left for REQ_OP_WRITE_SAME.  We only
> have two callers left, and both just export optional protocol features
> to remote systems: DRBD and the target code.

No particular objections from me. I had a half-baked series to do the
same thing.

One thing I would like is to either pull this series through SCSI or do
the block pieces in a post merge branch because I'm about to post my
discard/zeroing rework and that's going to clash with your changes.

-- 
Martin K. Petersen	Oracle Linux Engineering