linux-kernel - Re: Remaining BKL users, what to do

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Message-ID: <20100917140219.GA9454@infradead.org>
Date:	Fri, 17 Sep 2010 10:02:19 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Anton Altaparmakov <aia21@....ac.uk>, Jan Kara <jack@...e.cz>,
	codalist@...a.cs.cmu.edu, autofs@...ux.kernel.org,
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Petr Vandrovec <vandrove@...cvut.cz>,
	Anders Larsen <al@...rsen.net>,
	Evgeniy Dushistov <dushistov@...l.ru>,
	Ingo Molnar <mingo@...e.hu>, netdev@...r.kernel.org,
	Samuel Ortiz <samuel@...tiz.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Andrew Hendry <andrew.hendry@...il.com>
Subject: Re: Remaining BKL users, what to do

On Fri, Sep 17, 2010 at 03:50:49PM +0200, Arnd Bergmann wrote:
> On Friday 17 September 2010, Christoph Hellwig wrote:
> > 
> > On Fri, Sep 17, 2010 at 12:45:41PM +0200, Arnd Bergmann wrote:
> > > ncpfs: replace BKL with lock_super
> > 
> > Err, no.  lock_super is just as much on it's way out as the BKL.  We've
> > managed to move it down from the VFS into a few remaining filesystems
> > and now need to get rid of those users.  Please don't add any new ones.
> 
> Ok. I guess that's also a NAK for my the isofs patch I posted yesterday
> then. Do you have any suggestions for an alternative approach?

Just add a per-sb mutex inside the filesystem.  Given that lock_super
isn't used by the VFS anymore that's actually equivalent.

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