linux-kernel - Re: [PATCH 1/2] BKL: Remove BKL from default

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Message-ID: <20091118181712.14a2404c@lxorguk.ukuu.org.uk>
Date:	Wed, 18 Nov 2009 18:17:12 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jan Blunck <jblunck@...e.de>
Cc:	linux-fsdevel@...r.kernel.org,
	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, jkacur@...hat.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>,
	Christoph Hellwig <hch@...radead.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 1/2] BKL: Remove BKL from default_llseek()

> As I said, f_pos is changed without holding BKL in the VFS already. Therefore

IFF the VFS paths that change it can be invoked in parallel.

> even if the driver tries to protect f_pos by holding the BKL it is racing
> against concurrent read()/write() anyway on f_pos.

It may simply be a matter of internal consistency. Anyway I've now made a
list of the offenders so we can simply fix/delete them and continue.
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