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

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Message-ID: <20130327135155.GK5861@thunk.org>
Date:	Wed, 27 Mar 2013 09:51:55 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	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

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
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?

     	      	      	 	       - Ted
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