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

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Message-Id: <200705202002.53991.arvidjaar@mail.ru>
Date:	Sun, 20 May 2007 20:02:52 +0400
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	"Kay Sievers" <kay.sievers@...y.org>
Cc:	"Ray Lee" <ray-lk@...rabbit.org>,
	"Al Viro" <viro@....linux.org.uk>, "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 Sunday 20 May 2007, Kay Sievers wrote:
> 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?
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel"
> > in the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at  http://www.tux.org/lkml/
>
> 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.
>

Won't these be removed after "losetup -d"?

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