Re: [PATCH 1/4] block: Allow bdi re-registration

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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 <jack@xxxxxxxx>
SUSE Labs, CR



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