From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg KH <greg@kroah.com>
Date: Tue, 16 Aug 2005 21:28:56 +0000
Subject: Re: +rule: query device inode by Major and Minor - am i inventing brand new bycicle ?
Message-Id: <20050816212856.GA27757@kroah.com>
List-Id: <linux-hotplug.vger.kernel.org>
References: <4300318B.8040505@nm.ru>
In-Reply-To: <4300318B.8040505@nm.ru>
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To: linux-hotplug@vger.kernel.org

On Tue, Aug 16, 2005 at 09:13:42PM +0400, Arioch wrote:
> Kay Sievers ??????????:
> 
> >What nodes exactly have the same major/minor? That setup may need to be
> >fixed.
> 
> Now i think that %M and %m macros are expanded somehow strangely:
> 
> $ pwd
> /dev/.lookup_by_numbers
> 
> $for i in  DUP/*  ; do j=${i#*/}; h=${j%_*}; ls -l $h $i ; echo; done
> 
>     [... list skipped - there is longer and more detailed one below ...]
> 
> 
> I was intrigued by duplicating of /dev/null.
> Was this device created twice ???
> 
> 
> $ls -l ../ram3 ../nu*
> crw-rw-rw-  1 root root 1, 3 ?????? 16 19:47 ../null
> brw-rw----  1 root disk 1, 3 ?????? 16 19:47 ../ram3
> 
> You see, it seems character and block devices with same major|minor can 
> easily co-exist!

Of course they can.  For further examples, see Documentation/devices.txt
for all of the reserved major/minor numbers for character and block
devices.  Remember, character and block devices are totally separate
"namespaces".  The major/minor number is only unique within a character,
or a block "namespace".

thanks,

greg k-h


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