[dm-devel] Re: [PATCH v2] expose dm-stripe target's topology I/O hints

[Martin K. Petersen]

>>>>> "Mike" == Mike Snitzer <snitzer at redhat.com> writes:

Mike> Martin didn't expose such an interface because all existing code
Mike> (both DM and MD) does not require anything beyond a simple
Mike> assignment.  I worked with Martin to establish the
Mike> blk_queue_io_min() precisely because DM needed to avoid
Mike> duplicating the block layer's logic.  I think Martin stopped short
Mike> of adding a symmetric wrapper for setting io_opt because he felt
Mike> it was unnecessary.

Jens is a hardliner and refuses unused functions and wrappers in block.
Even when they are trivial/obvious/symmetric.

At the time I submitted the topology code there were no users of a
blk_limits_io_opt() call so I didn't wire it up.

If you need it now, then great.  Let's add it to be consistent.

-- 
Martin K. Petersen	Oracle Linux Engineering