linux-kernel - Re: [PATCH] sony_pi: Remove the BKL from sonypi_misc

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Message-ID: <20091022025514.GB17438@infradead.org>
Date:	Wed, 21 Oct 2009 22:55:14 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Arnd Bergmann <arndbergmann@...glemail.com>,
	John Kacur <jkacur@...hat.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] sony_pi: Remove the BKL from sonypi_misc_open

On Wed, Oct 21, 2009 at 11:31:42PM +0200, Frederic Weisbecker wrote:
> What about a pusdown of default_lseek attribution for these
> fops that don't have any llseek() (and rename it to
> deprecated_default_lseek() )
> 
> Because we can probably fix these fops one by one but what
> about the next drivers that will have no llseek() ?
> 
> We can't attribute default_llseek() by default anymore for
> further fops that are to come.

The right (although quite complicated) thing is to return -ESPIPE from
vfs_llseek if no ->llseek method is present, or even better also
disallowing pread/pwrite by default.  It'll need a quite substantial
audit and is best done by different types of inodes - S_IFIFO is easy,
SIFDIR at least has very few instances, S_IFREG usually wants a real
llseek (generic_file_llseek in most cases) and directories also need
a llseek method that takes i_mutex so it protects against namespace
operations.

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