On Sat, Sep 27, 2014 at 12:16 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
>
> FWIW, I suspect that the right approach is to put refcount + rcu_head in
> front of external name and do the following:
That's actually fancier than I was expecting. I was just thinking
doing a whole new allocation and freeing the old one using RCU. But I
guess you're right, you do need the rcu_head even for that, and once
you start adding fields you might as well just add a refcount too, and
then you don't have the annoyance of a potential memory allocation in
that code.
So your approach is better and doesn't sound too painful at all.
But yeah, I guess we can/should do the trivial ugly thing for 3.17.
Send me a proper pull-request,
Linus
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