linux-ext4 - Re: [PATCH] ext4: fix blkdev_issue

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Message-ID: <20090330174607.GR13356@mit.edu>
Date:	Mon, 30 Mar 2009 13:46:07 -0400
From:	Theodore Tso <tytso@....edu>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: fix blkdev_issue_flush() failure handling

On Mon, Mar 30, 2009 at 07:47:47AM -0400, Chris Mason wrote:
> > Yes, it was.  Although I got the idea when hch pointed out that SuSE did
> > this... thanks to Chris.  It's come full circle.  :)
> 
> Grin.  I'm not sure the I_DIRTY checks alone are enough to decide that a
> commit is required though.  I think the inode could be clean but still
> have metadata that needs commit.

So to close this hole, I think what we can do is to track the last
transaction id where ext4_do_update_inode() was called, and if that
transaction id == the currently running transaction id, then we need
to call ext4_force_commit() even though the inode is clean.  I think
that should fix up the race that you're concerned about.

     	    	       	    	 		  - Ted
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