linux-kernel - Re: [patch 9/9] mm: fix pagecache write deadlocks

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Date:	Sun, 4 Feb 2007 10:26:29 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Filesystems <linux-fsdevel@...r.kernel.org>,
	Linux Memory Management <linux-mm@...ck.org>
Subject: Re: [patch 9/9] mm: fix pagecache write deadlocks

On Sun, Feb 04, 2007 at 11:15:29AM +0100, Nick Piggin wrote:
> Cool, a kernel thread is calling sys_write. Fun.

There are tons of places where we possible call into ->write from
either kernel threads or at least with a kernel pointer  and set_fs/set_ds
magic.  Anything in the buffer write path that tries to touch page tables
can't work.

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