[dm-devel] REQUEST for new 'topology' metrics to be moved out of the 'queue' sysfs directory.

[Linus Torvalds]

On Thu, 25 Jun 2009, Martin K. Petersen wrote:
> 
> Neil> So I asked git why it as added, and it pointed to
> Neil>   commit 1308835ffffe6d61ad1f48c5c381c9cc47f683ec
> 
> Neil> which suggests that it was added so that user space could tell the
> Neil> kernel whether the device was rotational, rather than the other
> Neil> way around.
> 
> There's an option to do it via udev for broken devices that don't report
> it.  But both SCSI and ATA have a setting that gets queried and the
> queue flag set accordingly.

.. except few devices actually set it. 

That flag is _definitely_ all about the user being able to override it.

		Linus