Date: Sat, 3 Jan 2004 12:51:20 -0800
From: Greg KH <greg@kroah.com>
To: Andrey Borzenkov <arvidjaar@mail.ru>
Cc: linux-hotplug-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: removable media revalidation - udev vs. devfs or static /dev
Message-ID: <20040103205119.GA10802@kroah.com>
References: <200401012333.04930.arvidjaar@mail.ru> <20040103055847.GC5306@kroah.com> <200401031151.02001.arvidjaar@mail.ru>
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On Sat, Jan 03, 2004 at 11:51:33AM +0300, Andrey Borzenkov wrote:
> > You could make a script that just creates 
> > the device node in /tmp, runs dd on it, and then cleans it all up to
> > force partition scanning.
> >
> 
> You miss the point. When should this script be run? There is no event when you 
> just insert Jaz disk; nor is there any way to trigger revalidation on access 
> to non-existing device like is the case without udev.
> 
> what I aim at - udev needs to provide some extension mechanism to allow 
> arbitrarily scripts to be run.

It does provide that mechanism.  See the CALLOUT rule.  It can run any
program or script when a new device is seen by the kernel.

thanks,

greg k-h
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