linux-kernel - Re: [PATCH 00/13] cross rename v4

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Date:	Mon, 24 Feb 2014 09:49:47 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	David Howells <dhowells@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Bruce Fields <bfields@...ldses.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Zach Brown <zab@...hat.com>, Jan Kara <jack@...e.cz>,
	Andy Lutomirski <luto@...capital.net>,
	"mszeredi@...e.cz" <mszeredi@...e.cz>
Subject: Re: [PATCH 00/13] cross rename v4

On Mon, Feb 24, 2014 at 9:12 AM, Miklos Szeredi <miklos@...redi.hu> wrote:
>
> This patch uses the 0/0 device number, but the actual number doesn't matter
> as long as it doesn't conflict with a real device.

Side note: I think 0/0 is the right choice, for a very specific
reason: it is already documented as being special. No other
combination has that.

We've had "major number 0" documented as being for unnamed devices,
and minor 0 is "reserved as null device number", which is just bad
documentation (it's *not* /dev/null, it doesn't exist). You cannot
register a character device with mijor/minor 0 in Linux, for example.

(The block layer similarly considers MKDEV(0,0) to be an unallocated device)

            Linus
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