On Wed 08-03-17 17:55:42, Tejun Heo wrote:
> Hello,
>
> On Wed, Mar 08, 2017 at 05:48:31PM +0100, Jan Kara wrote:
> > @@ -710,6 +710,11 @@ static void cgwb_bdi_destroy(struct backing_dev_info
> > *bdi)
> > */
> > atomic_dec(&bdi->usage_cnt);
> > wait_event(cgwb_release_wait, !atomic_read(&bdi->usage_cnt));
> > + /*
> > + * Grab back our reference so that we hold it when @bdi gets
> > + * re-registered.
> > + */
> > + atomic_inc(&bdi->usage_cnt);
>
> So, this is more re-initializing the ref to the initial state so that
> it can be re-used, right? Maybe ATOMIC_INIT() is a better choice here
> just to clarify what's going on?
OK, I was somewhat undecided between these two option but you and James are
probably right that re-init is clearer.
Honza
--
Jan Kara <j...@suse.com>
SUSE Labs, CR
