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

[Greg KH]

On Wed, Jan 07, 2004 at 10:38:31AM -0800, Linus Torvalds wrote:
> 
> On Fri, 2 Jan 2004, Greg KH wrote:
> > 
> > Doesn't the kernel always create the main block device for this device?
> > If so, udev will catch that.
> 
> But udev should probably also create all the sub-nodes if it doesn't 
> already.

It doesn't, as I thought we could rely on the kernel partition support.

> 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.

thanks,

greg k-h
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