linux-kernel - Re: [PATCH 10/20] hpfs: replace BKL with a global mutex

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Message-Id: <E1PiPXR-0003dx-9z@pomaz-ex.szeredi.hu>
Date:	Thu, 27 Jan 2011 11:57:17 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Nick Piggin <npiggin@...il.com>
CC:	ak@...ux.intel.com, arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/20] hpfs: replace BKL with a global mutex

On Thu, 27 Jan 2011, Nick Piggin wrote:
> On Thu, Jan 27, 2011 at 3:52 AM, Andi Kleen <ak@...ux.intel.com> wrote:
> > On Wed, Jan 26, 2011 at 01:50:42PM +0100, Arnd Bergmann wrote:
> >> On Wednesday 26 January 2011, Andi Kleen wrote:
> >> > I don't think that's a very good idea, there's danger
> >> > of holding it over IO and that would be really bad (as in like MINIX[1])
> >> >
> >> > It would be better to do it the i810 way and check for the number of
> >> > CPUs at module init time and refuse to run if it's > 1
> >>
> >> I don't see much value of one evil over the other, but why not. The code
> >> is going away anyway unless someone cleans it up further.
> >
> > I think it's fine because systems running OS/2 likely only have
> > one CPU. This way these guys (if they exist) won't see any regression.
> 
> It would be really neat if there was a project to destage a lot of
> these old filesystems and implement read-only support with fuse
> implementations (not that I'm volunteering :P).

I did that using UML + fuse.  It's pretty neat, UML boots fast when it
doesn't need a big userspace, so the mount is done in a few hundred
milliseconds, and performance isn't horrible.  And you get support for
*all* the filesystems in a single 3MB executable.

The big drawback is that UML is not portable to lots of architectures
(x86 and ppc are the only ones it works on, I think).

Thanks,
Miklos
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