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SubjectRe: [PATCH 08/18] virtiofs: Drain all pending requests during ->remove time
On Fri, Sep 06, 2019 at 10:17:05AM -0400, Vivek Goyal wrote:
> On Fri, Sep 06, 2019 at 11:52:10AM +0100, Stefan Hajnoczi wrote:
> > On Thu, Sep 05, 2019 at 03:48:49PM -0400, Vivek Goyal wrote:
> > > +static void virtio_fs_drain_queue(struct virtio_fs_vq *fsvq)
> > > +{
> > > + WARN_ON(fsvq->in_flight < 0);
> > > +
> > > + /* Wait for in flight requests to finish.*/
> > > + while (1) {
> > > + spin_lock(&fsvq->lock);
> > > + if (!fsvq->in_flight) {
> > > + spin_unlock(&fsvq->lock);
> > > + break;
> > > + }
> > > + spin_unlock(&fsvq->lock);
> > > + usleep_range(1000, 2000);
> > > + }
> >
> > I think all contexts that call this allow sleeping so we could avoid
> > usleep here.
>
> usleep_range() is supposed to be used from non-atomic context.
>
> https://github.com/torvalds/linux/blob/master/Documentation/timers/timers-howto.rst
>
> What construct you are thinking of?
>
> Vivek

completion + signal on vq callback?

--
MST

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