linux-ext4 - Re: [PATCH] ext4: fix freeze deadlock under IO

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Date:	Sun, 1 Aug 2010 17:41:32 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Eric Sandeen <sandeen@...deen.net>
Cc:	Phillip Susi <psusi@....rr.com>, Mike Snitzer <snitzer@...hat.com>,
	device-mapper development <dm-devel@...hat.com>,
	linux-fsdevel@...r.kernel.org, Eric Sandeen <sandeen@...hat.com>,
	ext4 development <linux-ext4@...r.kernel.org>,
	Dave Chinner <dchinner@...hat.com>
Subject: Re: [PATCH] ext4: fix freeze deadlock under IO

On Wed, Jun 23, 2010 at 02:37:27PM -0500, Eric Sandeen wrote:
> Commit 6b0310fbf087ad6 caused a regression resulting in deadlocks
> when freezing a filesystem which had active IO; the vfs_check_frozen
> level (SB_FREEZE_WRITE) did not let the freeze-related IO syncing
> through.  Duh.
> 
> Changing the test to FREEZE_TRANS should let the normal freeze
> syncing get through the fs, but still block any transactions from
> starting once the fs is completely frozen.
> 
> I tested this by running fsstress in the background while periodically
> snapshotting the fs and running fsck on the result.  I ran into
> occasional deadlocks, but different ones.  I think this is a
> fine fix for the problem at hand, and the other deadlocky things
> will need more investigation.
> 
> Reported-by: Phillip Susi <psusi@....rr.com>
> Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Applied to the ext4 patch queue.  Sorry for missing this earier.

	       	    	  	  	    - Ted
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