[dm-devel] [PATCH 2/5] block: make bio_inc_remaining() interface accessible again

[Christoph Hellwig]

On Fri, May 06, 2016 at 12:19:16PM -0400, Mike Snitzer wrote:
> (this is a direct result of completing the discard bio before all
> mappings, and associated sub-discards, have):

The completion order really should not matter, we rely on it not
mattering for almost every usage of the bio_chain API.  So there
is something else fishy going on here.  What's your test case?
I'd like to dig a bit deeper into this.