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Date: Mon, 24 Feb 2014 09:49:47 -0800
Message-ID: <CA+55aFzCA4eE0+dnXHcOVpMKwxx425XzwBf-4pbcHF6JST321w@mail.gmail.com>
Subject: Re: [PATCH 00/13] cross rename v4
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: David Howells <dhowells@redhat.com>, Al Viro <viro@zeniv.linux.org.uk>,
        Linux-Fsdevel <linux-fsdevel@vger.kernel.org>,
        Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Bruce Fields <bfields@fieldses.org>,
        Christoph Hellwig <hch@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>, Zach Brown <zab@redhat.com>,
        Jan Kara <jack@suse.cz>, Andy Lutomirski <luto@amacapital.net>,
        "mszeredi@suse.cz" <mszeredi@suse.cz>
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Sender: linux-kernel-owner@vger.kernel.org

On Mon, Feb 24, 2014 at 9:12 AM, Miklos Szeredi <miklos@szeredi.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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