What If I Don't Actually Like My Users?

So a really quite substantial bug (affecting perhaps 3% of all calls to 
this function in nontrivial directories) persisted for *a quarter of a 
century* before anyone noticed it.

I suspect that seekdir()/telldir() has exactly one user: Samba. Given how 
horrible it makes filesystem implementations, and the closeness of Samba 
implementors to the kernel, I'm not sure that it's worth preserving this 
function for that one user (which is privileged in any case so the usual 
oops-it-might-use-up-too-much-memory arguments against a naive 
entirely-in-VFS implementation do not apply).

Votes to make seekdir()/telldir() root-only, anyone?