Re: removable media revalidation - udev vs. devfs or static /dev

[Mika Penttilä]

Greg KH wrote:

> On Wed, Jan 07, 2004 at 09:23:39PM +0200, Mika Penttilä wrote:
>  
>
> > Greg KH wrote:
> >    
> >
> > > On Wed, Jan 07, 2004 at 10:38:31AM -0800, Linus Torvalds wrote:
> > >      
> > >
> > > > And it really has to create _all_ of them, exactly because there's no way
> > > > to know ahead-of-time which of them will be available.
> > > >
> > > > Then, user space can just access "/dev/sda1" or whatever, and the act of 
> > > > accessing it will force the re-scan.
> > > >  
> > > >
> > > >        
> > > Hm, that would work, but what about a user program that just polls on
> > > the device, as the rest of this thread discusses?  As removable devices
> > > are not the "norm" it would seem a bit of overkill to create 16
> > > partitions for every block device, if they need them or not.
> > >
> > >      
> > Accessing the partition would not cause the rescan (accessing the whole 
> > disk causes.) I think devfs does/did this rescan on access.
> >    
>
> It would rescan on access of a partition or the main block device?
>
> If accessing the partition doesn't work, than having udev create all
> partitions wouldn't help anything :(
>
> thanks,
>
> greg k-h
>  

Right, rescan on access of main block device works, partition not, afaics.

--Mika


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