On Wed, Aug 15, 2007 at 07:46:24PM -0700, Jason Thorpe wrote:
> Disks certainly used to be kept on a global list... This may have  
> changed recently, I guess?
>

They are still kept on a global list.
 
> How are disk stats returned to userland now?
> 

Disk stats are no longer kept in the actual disk structure, I split
them out when I did some work on generalising the i/o device statistic
collecting.  The disk struct has a pointer to a stats structure that
is associated with the device - all the stats structures are kept on
another linked list so userland can just walk that to retrieve the i/o
stats.

-- 
Brett Lymn