[Drbd-dev] [dm-devel] [RFC PATCH 00/32] separate operations from flags in the bio/request structs

[Christoph Hellwig]

On Wed, Nov 11, 2015 at 01:53:24AM -0600, Mike Christie wrote:
> We no longer have the bvec merge functions so the original reason given
> in the thread/patch Bart referenced is no longer valid.
> 
> Offlist it was suggested that dropping the argument from submit_bio
> might still improve performance, but I modified xfs and dm and did some
> testing and did not see anything.
> 
> So the change is not needed, and it would only be done because people
> feel it would improve the interface.

I would defintively prefer the changed interface, and to me it also
looks like it would make your overall patch simpler.  If you disagree
feel free to keep it as-is for now and I'll do another pass later.