linux-ext4 - Re: [PATCH] ext4: don't call ext4_should_journal

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Message-ID: <20160703051505.GA17739@thunk.org>
Date:	Sun, 3 Jul 2016 01:15:05 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Vegard Nossum <vegard.nossum@...cle.com>
Cc:	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] ext4: don't call ext4_should_journal_data() on the
 journal inode

On Sat, Jul 02, 2016 at 11:42:42PM +0200, Vegard Nossum wrote:
> Certain combinations of mount options in the superblock will cause
> set_journal_csum_feature_set() in ext4_fill_super() to fail after the
> journal has been created. When iput() is called on the journal inode,
> we will hit the BUG() in ext4_should_journal_data(). We can prevent
> this by only calling ext4_should_journal_data() if we already know
> that it's not the journal inode.

Which mount options?  Can you please give a reproducer?

      	    	      	      	     - Ted
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