Hi,
On Dec 10, 2007 11:31 PM, Jonathan Corbet <[email protected]> wrote:
> I'm just getting around to looking at this. One thing jumped out at me:
>
> > + if (bio->bi_throttle) {
> > + struct request_queue *q = bio->bi_queue;
> > + bio->bi_throttle = 0; /* or detect multiple endio and err? */
> > + atomic_add(bio->bi_throttle, &q->available);
> > + wake_up(&q->throttle_wait);
> > + }
>
> I'm feeling like I must be really dumb, but...how can that possibly
> work? You're zeroing >bi_throttle before adding it back into
> q->available, so the latter will never increase...
Heh, well, that's ok as long as bio->bi_vcnt is set to zero and I think we
have some md raid drivers do just that... ;-)
Pekka
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