linux-kernel - Re: [PATCH 13/18] fs: split locking of inode writeback and LRU lists

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Date:	Fri, 8 Oct 2010 04:18:16 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/18] fs: split locking of inode writeback and LRU lists

On Fri, Oct 08, 2010 at 07:00:18PM +1100, Dave Chinner wrote:
> > >  
> > > -		if (inode->i_state & (I_NEW | I_WILL_FREE)) {
> > > +		if (inode->i_state & (I_NEW | I_WILL_FREE | I_FREEING)) {
> > >  			requeue_io(inode);
> > >  			continue;
> > >  		}
> > 
> > What does this have to do with the rest of the patch?
> 
> That's because there's now a window between setting I_FREEING and taking
> the inode off the writeback list which means that we can see inodes
> in that state here. Generally it means that the code setting
> I_FREEING is spinning waiting for the wb->b_lock that this thread
> currently holds so it can be removed from the list.. Hence the requeue
> to move the inode out of the way and keep processing inodes for
> writeback.

That needs some documentation both in the changelog and in the code
I think.

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