linux-kernel - Re: [RFC][5/11][MANUX] Kernel compatibility : major/minor numbers

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Message-ID: <534D4A1B.30002@gmail.com>
Date:	Tue, 15 Apr 2014 11:02:51 -0400
From:	Austin S Hemmelgarn <ahferroin7@...il.com>
To:	Emmanuel Colbus <ecolbus@...ux.info>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][5/11][MANUX] Kernel compatibility : major/minor numbers

On 2014-04-15 09:42, Emmanuel Colbus wrote:
> Now, back to the filesystem...
> 
> In order to associate devices to their files, the Linux kernel uses
> their major and minor numbers. However, mine doesn't; instead, I've
> attributed myself a single group of values (major=0, minor=0, for both
> character-mode and block-mode special files), with the meaning (for the
> userspace) "you cannot identify the content of this file based on its
> major and minor numbers".
> 
> As for my kernel, there is a syscall to associate such files with their
> proper peripherals (asper(2)), after which it internally identifies them
> using their inode and partition numbers; as for userspace, it has no
> choice but to use their names, as usual.
> 
> Do you have any objection to my taking of these values?
> 

According to Documentation/devices.txt:
	0		Unnamed devices (e.g. non-device mounts)
			0 = reserved as null device number

Based on this, I would say that you are probably better off using one of
the local use numbers (60-63 and 250-254 are reserved for local and
experimental use)

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