linux-ext4 - Re: More ext4 acl/xattr corruption

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Message-ID: <20090515125035.GC9173@mit.edu>
Date:	Fri, 15 May 2009 08:50:35 -0400
From:	Theodore Tso <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Kevin Shanahan <kmshanah@...b.org.au>,
	Andreas Dilger <adilger@....com>, Alex Tomas <bzzz@....com>,
	linux-ext4@...r.kernel.org
Subject: Re: More ext4 acl/xattr corruption - 4th occurence now

On Thu, May 14, 2009 at 08:21:05PM -0500, Eric Sandeen wrote:
> 
> it should lay out a 4g file in random 1m direct IOs to fragment it and
> get a lot of extents, then launch 2 threads, one each doing random reads
> and random writes of that same file.
> 
> I can't make this trip it, though ...

If all of the blocks are in the page cache, you won't end up calling
ext4_get_blocks().  Try adding a shell script which runs in parallel
doing a "while /bin/true ; do sleep 1; echo 3 > /proc/sys/vm/drop_cache; done".

							- Ted
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