[PATCH 04/12] block_dev: only write bdev inode on close

[Christoph Hellwig]

On Sun, Jan 11, 2015 at 12:32:09PM -0500, Tejun Heo wrote:
> Is this an optimization or something necessary for the following
> changes?  If latter, maybe it's a good idea to state why this is
> necessary in the description?  Otherwise,

It gets rid of a bdi reassignment, and thus makes life a lot simpler.
I'll update the commit message.