simplify gendisk and request_queue allocation for bio based drivers

[Ulf Hansson]

On Wed, 26 May 2021 at 06:49, Christoph Hellwig <hch at lst.de> wrote:
>
> On Wed, May 26, 2021 at 12:41:37AM +0200, Ulf Hansson wrote:
> > On Fri, 21 May 2021 at 07:51, Christoph Hellwig <hch at lst.de> wrote:
> > >
> > > Hi all,
> > >
> > > this series is the first part of cleaning up lifetimes and allocation of
> > > the gendisk and request_queue structure.  It adds a new interface to
> > > allocate the disk and queue together for bio based drivers, and a helper
> > > for cleanup/free them when a driver is unloaded or a device is removed.
> >
> > May I ask what else you have in the pipe for the next steps?
> >
> > The reason why I ask is that I am looking into some issues related to
> > lifecycle problems of gendisk/mmc, typically triggered at SD/MMC card
> > removal.
>
> In the short run not much more than superficial cleanups.  Eventually
> I want bio based drivers to not require a separate request_queue, leaving
> that purely as a data structure for blk-mq based drivers.  But it will
> take a while until we get there, so it should not block any fixes.

Alright, thanks for clarifying.

>
> For hot unplug handling it might be worth to take a look at nvme, as it
> is tested a lot for that case.

Okay, thanks for the hint.

Kind regards
Uffe