From mboxrd@z Thu Jan  1 00:00:00 1970
From: Goffredo Baroncelli <kreijack@libero.it>
Subject: Re: minor ID for btrfs-control
Date: Sun, 03 Apr 2011 12:24:05 +0200
Message-ID: <4D984AC5.3040207@libero.it>
References: <Bj8lm4ND1uB@helmut.hullen.de>
Reply-To: kreijack@inwind.it
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Cc: Helmut Hullen <Hullen@t-online.de>, linux-btrfs@vger.kernel.org
To: helmut@hullen.de
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In-Reply-To: <Bj8lm4ND1uB@helmut.hullen.de>
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Hello Helmut,

On 04/03/2011 05:11 AM, Helmut Hullen wrote:
> Hallo, Goffredo,
[..]
>> As wrote by Tomasz the minor number of the btrfs-control is allocated
>> dynamically.
> 
> At which place?

I replied you too fast. Btrfs register a "misc" device, but its number
is not dynamically allocated (see [1] for further information), but it
is static.

$ grep BTRFS_MINOR -r include/
include/linux/miscdevice.h:#define BTRFS_MINOR          234

I can conclude that _now_ the minor is 234 and not 55. But I don't know
if it is a _stable_ interface.

I think that during the boot you should check the minor with

grep btrfs-control /proc/misc | awk '{ print $1 }'


Regards
G.Baroncelli

[1] http://www.linuxjournal.com/article/2920

> 
> Viele Gruesse!
> Helmut
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