Re: What to do about the 2TB limit on HDIO_GETGEO ?

[H. Peter Anvin]

Greg KH wrote:
> On Tue, Mar 25, 2008 at 01:36:51PM -0700, H. Peter Anvin wrote:
> > Randy Dunlap wrote:
> > > > Come on people, adding symlinks for device major:minor numbers in sysfs
> > > > to save a few 10s of lines of userspace code?  Can things get sillier?
> > > >
> > > > You can add a single udev rule to probably build these in a tree in /dev
> > > > if you really need such a thing...
> > > >
> > > > And what's wrong with your new ioctl recomendation?
> > > Ah, there's some sanity.  :)
> > It's not so much an issue of a few tens of lines of user space code, but 
> > rather the fact that something that should be O(1) is currently O(n).
>
> "should"?  why?  Is this some new requirement that everyone needs?  I've
> _never_ seen anyone ask for the ability to find sysfs devices by
> major:minor number in O(1) time.  Is this somehow a place where such
> optimization is warranted?

Well, when dealing with shell scripts a O(n) very easily becomes O(n^2). 
 For the stuff that I, personally, do, it's not a big deal, but people 
with large number of disks have serious gripes with our boot times.

	-hpa
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