linux-ext4 - Re: Oops with ext4 from 2.6.27-rc3

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Message-ID: <20080813220100.GE6142@mit.edu>
Date:	Wed, 13 Aug 2008 18:01:00 -0400
From:	Theodore Tso <tytso@....edu>
To:	Christian Hesse <mail@...rm.de>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Oops with ext4 from 2.6.27-rc3

On Wed, Aug 13, 2008 at 11:07:06PM +0200, Christian Hesse wrote:
> 
> Please look at the bottom of my last two mails... That was with your patch 
> applied.

Sorry, I missed it.  The new BUG seems to be a bug in the delayed
allocation code, specifically here, in fs/ext4/inode.c:ext4_da_release_space():

	   /* figure out how many metablocks to release */
	   BUG_ON(mdb > EXT4_I(inode)->i_reserved_meta_blocks);
	   mdb_free = EXT4_I(inode)->i_reserved_meta_blocks - mdb;

I've quickly looked at the code, and how i_reserved_meta_blocks gets
updated, and nothing *obviously* wrong is jumping out at me.  Anyone
else have time to investigate this a bit more deeply?

     	       	  	      	     	 - Ted

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