[dm-devel] [PATCH -stable] block: destroy bdi before blockdev is unregistered.

[Christoph Hellwig]

On Wed, Apr 29, 2015 at 07:25:30AM +1000, NeilBrown wrote:
> As bdi_set_min_ratio doesn't touch bdi->dev, there seems to be no need for
> the test, or the warning.
> 
> I wonder if it would make sense to move the bdi_set_min_ratio() call to
> bdi_destroy, and discard bdi_unregister??
> There is a comment which suggests bdi_unregister might be of use later, but
> it might be best to have a clean slate in which to add whatever might be
> needed??

This seems fine to me from the block dev point of view.  I don't really
understand the bdi_min_ratio logic, but Peter might have a better idea.