[PATCH] NVMe: Use IDA for namespace disk naming

[Christoph Hellwig]

On Tue, Feb 23, 2016 at 10:56:36PM +0000, Keith Busch wrote:
> > This looks sensible, but I fear we might be running into the same
> > issue with the backing_device embedded in the request_queue.
> 
> I don't think I follow. On rescanning, a new namespace with the same
> NSID as a previously deleted one will allocate a new request_queue.

But the bdi name embedds the major/minor of the device.  So if we
haven't fully torn down the device we might run into sysfs name
conflicts.