linux-kernel - Re: [lxc-devel] [RFC PATCH 00/11] Add support for devtmpfs in user namespaces

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Message-ID: <87tx89od74.fsf@x220.int.ebiederm.org>
Date:	Wed, 28 May 2014 13:33:51 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	LXC development mailing-list 
	<lxc-devel@...ts.linuxcontainers.org>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Jens Axboe <axboe@...nel.dk>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [lxc-devel] [RFC PATCH 00/11] Add support for devtmpfs in user namespaces

"Serge E. Hallyn" <serge@...lyn.com> writes:
>> I was aware of FUSE but hadn't ever looked at it much. Looking at it
>> now, this isn't going to satisfy any of the use cases I know about,
>> which are wanting to use filesystems supported in-kernel (isofs, ext*).
>> I don't see that any of these have a FUSE implementation, and I think we
>> gain more from figuring out how to use in-kernel filesystems in
>> containers than trying to find a way to shoehorn selected filesystems
>> into FUSE.
>
> That's why I was wondering how much work it would be to auto-generate
> fuse fs support from the in-kernel source.

So at a quick look I have found fuseext2, fuseiso and mountlo-0.5 (which
claims to have supported all the in-kernel filesystems with the help of
user mode linux).

Give that the first two are just an apt-get install away fuse really
looks like the shortest path to being able to mount an iso, do other
interesting things.

We probably want something more but only when performance becomes a
bottle-neck.

Eric

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