linux-kernel - Re: How to cope with two incompatible overlayfs formats out in the wild

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Message-ID: <20141119015908.GV7996@ZenIV.linux.org.uk>
Date:	Wed, 19 Nov 2014 01:59:08 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Andy Whitcroft <apw@...onical.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Neil Brown <neilb@...e.de>, linux-unionfs@...r.kernel.org,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: How to cope with two incompatible overlayfs formats out in the
 wild

On Tue, Nov 18, 2014 at 03:28:03PM +0100, Miklos Szeredi wrote:

> So from mainline we need two things:
> 
>   - when mounting distinguish between old and new format.
> 
>   - userspace can detect which formats are supported by the kernel.
> 
> If we'd have a different filesystem type for the old and new formats,
> then that would solve both (checking /proc/filesystems would indicate
> which one is supported).
> 
> Unfortunately that would mean having to change "overlayfs" type to
> something else in 3.18.  Question is, is there some sane name which
> would fit?  "overlayfs2" is perhaps the best, but I'm not overly
> enthusiastic about it.
> 
> Any other ideas?

Umm...  What does the old one do when it sees workdir=<something> in the
options?
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