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

Greg KH
2004-01-07T19:24:43Z

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