[Drbd-dev] [PATCH 06/23] dm-kcopyd: switch to use REQ_OP_WRITE_ZEROES

[Christoph Hellwig]

On Thu, Mar 23, 2017 at 10:55:22AM -0400, Mike Snitzer wrote:
> See commit 70d6c400a ("dm kcopyd: add WRITE SAME support to dm_kcopyd_zero")
> drivers/md/dm-io.c:do_region() adjusts the WRITE SAME payload to be a
> single page.
> 
> So you'd want to tweak dm-io.c accordingly for WRITE ZEROES (presummably
> no payload?)

Yeah, I'll look into it.  Any good test case for verifying this code
while I've got your attention?