linux-ext4 - Re: [PATCH] ext4: Fix deadlock in ext4_write_begin() and ext4_da_write

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Message-ID: <20090223021635.GM17066@mit.edu>
Date:	Sun, 22 Feb 2009 21:16:35 -0500
From:	Theodore Tso <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Fix deadlock in ext4_write_begin() and
	ext4_da_write_begin()

On Thu, Feb 19, 2009 at 03:24:48PM +0100, Jan Kara wrote:
> Functions ext4_write_begin() and ext4_da_write_begin() call
> grab_cache_page_write_begin() without AOP_FLAG_NOFS. Thus it
> can happen that page reclaim is triggered in that function
> and it recurses back into the filesystem (or some other filesystem).
> But this can lead to various problems as a transaction is already
> started at that point. Add the necessary flag.
> 
> (Reported in http://bugzilla.kernel.org/show_bug.cgi?id=11688)
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, queued.

Signed-off-by: "Theodore Ts'o" <tytso@....edu>

						- Ted
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