On 08/14/2016 11:23 AM, Dan Williams wrote:

[ adding Bart back to the cc ]

On Sun, Aug 14, 2016 at 11:08 AM, Dan Williams [off-list ref] wrote:

quoted

On Sun, Aug 14, 2016 at 10:20 AM, James Bottomley
[off-list ref] wrote:

[..]

quoted

I like it.  I still think the bdi registration code should be in
charge of taking the extra reference on the disk device's parent to
isolate / make clear why the extra reference is being acquired, but I
won't lose sleep if Jens takes your smaller change.

Thanks James!

Bart, do you have a test configuration already set up for this case.
Can you give the 2 patches from James a try?

https://patchwork.kernel.org/patch/9278201/
https://patchwork.kernel.org/patch/9279513/

Hello Dan,

The "sysfs: cannot create duplicate filename" issue is something I ran 
into sporadically before I started using my patch that fixes this issue. 
I have not yet found a systematic way to trigger this behavior. Anyway, 
I will drop my patch and will start testing James' two patches. It will 
take a few days to test these patches thoroughly.

Bart.