[Cluster-devel] [PATCH] fs, dlm: Don't leak, don't do pointless NULL checks and use kzalloc

[David Teigland <teigland@redhat.com>]

On Wed, Jun 29, 2011 at 11:51:00PM +0200, Jesper Juhl wrote:
> > I don't think so; num_nodes won't be set to zero.
> 
> Hmm. How so?  Maybe I'm missing something obvious, but;
> num_nodes is initialized to zero at the beginning of the function, which 
> means that we'll definately do the first allocation in the loop.

Zero is meant to mean "first time through the loop".

> We then set num_nodes equal to ls->ls_num_nodes - what guarantees that 
> this will not be zero so we won't do a second allocation (and leak) the 
> second time through the loop?

That's just the nature of a lockspace, I guess -- it doesn't make sense or
exist without nodes in it.  I doubt any of the dlm code would work if that
weren't true.

Dave