linux-kernel - Re: bug in 2.6.22-rc2: loop mount limited to one single iso image

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Message-ID: <3ae72650705200854x6a2c829fueff3652653fc21da@mail.gmail.com>
Date:	Sun, 20 May 2007 17:54:32 +0200
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Ray Lee" <ray-lk@...rabbit.org>
Cc:	"Al Viro" <viro@....linux.org.uk>,
	"Andrey Borzenkov" <arvidjaar@...l.ru>,
	"Uwe Bugla" <uwe.bugla@....de>, "Ken Chen" <kenchen@...gle.com>,
	linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
Subject: Re: bug in 2.6.22-rc2: loop mount limited to one single iso image

On 5/20/07, Ray Lee <ray-lk@...rabbit.org> wrote:
> On 5/19/07, Al Viro <viro@....linux.org.uk> wrote:
> > On Sat, May 19, 2007 at 11:16:59PM -0700, Ray Lee wrote:
> > > Ken? Ball's in your court. As the patch isn't providing a killer
> > > feature for 2.6.22, I'd suggest just reverting it for now until the
> > > issues are ironed out.
> >
> > Hold it.  The real question here is which logics do we want there.
> > IOW, and how many device nodes do we want to appear and _when_ do
> > we want them to appear?
>
> The when part is what looks to make it racy. I'm guessing that we're
> relying on udev to create those loop nodes. If so, I think any scheme
> that creates more on demand would give transient mount errors while
> it's waiting on udev to create more nodes.
>
> Perhaps if we were to start with 8 loop nodes at init (as we have in
> 2.6.21), and then always maintain a margin of 8 (or 4, or...) when
> they start being used or detached?
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Until the tools can request dynamic loop device allocation from the
kernel before they want to use the device, you can create as many as
needed "static" loop* nodes in /lib/udev/devices/, which will be
copied to /dev/ early on every bootup.

Kay
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