linux-kernel - Re: [ 36/71] ext4: lock i_mutex when truncating orphan inodes

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Date:	Thu, 17 Jan 2013 16:46:16 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	alan@...rguk.ukuu.org.uk,
	Alexander Beregalov <a.beregalov@...il.com>,
	Theodore Tso <tytso@....edu>, Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [ 36/71] ext4: lock i_mutex when truncating orphan inodes

On Thu, Jan 17, 2013 at 06:07:11PM -0200, Herton Ronaldo Krzesinski wrote:
> On Tue, Jan 15, 2013 at 02:54:33PM -0800, Greg Kroah-Hartman wrote:
> > 3.0-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Theodore Ts'o <tytso@....edu>
> > 
> > commit 721e3eba21e43532e438652dd8f1fcdfce3187e7 upstream.
> > 
> > Commit c278531d39 added a warning when ext4_flush_unwritten_io() is
> > called without i_mutex being taken.  It had previously not been taken
> > during orphan cleanup since races weren't possible at that point in
> > the mount process, but as a result of this c278531d39, we will now see
> > a kernel WARN_ON in this case.  Take the i_mutex in
> > ext4_orphan_cleanup() to suppress this warning.
> > 
> > Reported-by: Alexander Beregalov <a.beregalov@...il.com>
> > Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> > Reviewed-by: Zheng Liu <wenqing.lz@...bao.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> By the description and looking at commit c278531d39, this change isn't
> needed for 3.0 or 3.4 kernels (anything <= 3.6), they don't contain
> commit c278531d39.

Ah, good catch.  Should this be reverted from 3.0 and 3.4?

thanks,

greg k-h
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