linux-ext4 - Re: [PATCH] ext4: take i_mutex in ext4_symlink to eliminate a warning from ext4

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Message-ID: <20130327151922.GA4487@gmail.com>
Date:	Wed, 27 Mar 2013 23:19:22 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
	Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [PATCH] ext4: take i_mutex in ext4_symlink to eliminate a
 warning from ext4_truncate

On Wed, Mar 27, 2013 at 11:07:35PM +0800, Zheng Liu wrote:
> On Wed, Mar 27, 2013 at 09:51:55AM -0400, Theodore Ts'o wrote:
> > Ah, now I see.  Thanks for sending the stack trace.  On the failure
> > path, we're calling the inline function ext4_truncate_filaed_write()
> > and this is calling ext4_truncate().
> > 
> > But I'm now wondering if we need to take the i_data_sem mutex in
                                                 ^^^
Sigh, I misread i_data_sem and i_mutex.  Really sorry about that. :-/

> > ext4_truncate_failed_write().
> > 
> > Otherwise, couldn't we end up with problems where a failed write calls
> > ext4_truncate() without i_data_sem(), and that races with something
> > else --- say, a punch or truncate call to that same inode?

Let me think about it.  I need to take a close look at it.

Regards,
                                                - Zheng
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