Re: [dm-devel] dm: pass up rotational flag

[Mike Snitzer <snitzer redhat com>]

On Thu, May 26 2011 at  2:29pm -0400,
Martin K. Petersen <martin petersen oracle com> wrote:

> >>>>> "Mike" == Mike Snitzer <snitzer redhat com> writes:
> 
> >> Allow the NONROT flag to be passed through to linear mappings if all
> >> underlying device are non-rotational. Tools like ureadahead will
> >> schedule IOs differently based on the rotational flag.
> 
> Mike> Thanks for doing this, looks good in general.
> 
> I'd rather we made the rotational property part of the topology instead
> of having to special-case it in DM. I seem to recall posting a patch
> that did that at some point but I can't seem to find it...

Sure, that'd work too.

Similarly, couldn't the discard flag be made part of topology?

Mike