On Wed, Nov 14, 2007 at 10:44:56PM +1100, Paul Mackerras wrote:
quoted text
> David Miller writes:
> 
> > This is my impression too, all of the things being done with
> > a slew of system calls would be better served by real special
> > files and appropriate fops.
> 
> Special files and fops really only work well if you can coerce the
> interface into one where data flows predominantly one way.  I don't
> think they work so well for something that is more like an RPC across
> the user/kernel barrier.  For that a system call is better.
> 
> For instance, if you have something that kind-of looks like
> 
> 	read_pmds(int n, int *pmd_numbers, u64 *pmd_values);
> 
> where the caller supplies an array of PMD numbers and the function
> returns their values (and you want that reading to be done atomically
> in some sense), how would you do that using special files and fops?
> 
Yes, the read call could be simplified to the level proposed above by Paul.

-- 
-Stephane
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