Re: [Evms-devel] Re: EVMS Submission for 2.5

Greg KH
2002-10-05T00:03:41Z

On Fri, Oct 04, 2002 at 10:07:24AM +0200, Oliver Neukum wrote:
> On Friday 04 October 2002 00:56, Greg KH wrote:
> > On Thu, Oct 03, 2002 at 11:02:36PM +0200, Oliver Neukum wrote:
> > > Perhaps this is a misunderstanding.
> > > You need to report changes of the actual physical medium of eg. a zip
> > > drive. How you want to do this from a class driver, I fail to see.
> >
> > When a "medium" goes away from the system, it is unregistered somehow,
> > right? So, in the disk class, that device would disappear, and cause
> > the /sbin/hotplug event.
>
> Well, sadly this is not the case. You can put a medium into a drive and
> pull it out without the kernel ever noticing. Unless of course you try to use
> the thing. But even in this case there's no hotplug event.
> Yet user space and evms have to learn about it in the long term.
> Changing a medium can mean that a new type of medium is inserted.
> A modern zip drive goes from 100M(ro) to 250M(rw) and even 750M(rw)
> We need to know and report.

I agree we need to know this. And if the kernel figures it out
(somehow) then userspace should also be told about this, through
/sbin/hotplug. That's all I'm saying.

thanks,

greg k-h