Date: Wed, 7 Jan 2004 11:24:34 -0800
From: Greg KH <greg@kroah.com>
To: Mika =?iso-8859-1?Q?Penttil=E4?= <mika.penttila@kolumbus.fi>
Cc: Linus Torvalds <torvalds@osdl.org>, Andrey Borzenkov <arvidjaar@mail.ru>,
       linux-hotplug-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: removable media revalidation - udev vs. devfs or static /dev
Message-ID: <20040107192434.GA823@kroah.com>
References: <200401012333.04930.arvidjaar@mail.ru> <20040103055847.GC5306@kroah.com> <Pine.LNX.4.58.0401071036560.12602@home.osdl.org> <20040107185656.GB31827@kroah.com> <3FFC5CBB.5050507@kolumbus.fi>
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On Wed, Jan 07, 2004 at 09:23:39PM +0200, Mika Penttil? 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
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