Re: [PATCH 09/60] dm: dm.c: replace 'bio->bi_vcnt == 1' with !bio_multiple_segments

[Kent Overstreet]

On Mon, Oct 31, 2016 at 08:29:01AM -0700, Christoph Hellwig wrote:
> On Sat, Oct 29, 2016 at 04:08:08PM +0800, Ming Lei wrote:
> > Avoid to access .bi_vcnt directly, because it may be not what
> > the driver expected any more after supporting multipage bvec.
> > 
> > Signed-off-by: Ming Lei <tom.leiming@xxxxxxxxx>
> 
> It would be really nice to have a comment in the code why it's
> even checking for multiple segments.

Or ideally refactor the code to not care about multiple segments at all.