linux-kernel - Re: [PATCH] vfs: add d

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Date:	Wed, 12 Oct 2011 08:56:49 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Sage Weil <sage@...dream.net>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, viro@...IV.linux.org.uk,
	ceph-devel@...r.kernel.org, rwheeler@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfs: add d_prune dentry operation

On Tue, Oct 11, 2011 at 08:39:24AM -0700, Sage Weil wrote:
> On Mon, 10 Oct 2011, Christoph Hellwig wrote:
> > On Mon, Oct 10, 2011 at 09:19:43AM -0700, Sage Weil wrote:
> > > Let me know if the below is clearer.  The requirement is that ->d_prune be 
> > > called prior to unhashing (and then destroying) a victim dentry.  I'm a 
> > > little worried about mixing that in with the lru helpers because it is 
> > > only indirectly related to whether the dentry is on the LRU, and that may 
> > > confuse people.  A cleaned up opencoded patch is here:
> > > 
> > > 	https://github.com/NewDreamNetwork/ceph-client/commit/784a6aa6dc7baf2069c40988d79130dba17c7068
> > > 
> > > and the updated dentry_lru_prune() wrapper version is below.
> > 
> > Long term what I really want is a helper for doing more of the real
> > removal in single place.  This is one step towards it, and the series
> > from Dave is another.
> 
> Ah, makes sense.
> 
> Dave, is the revised patch more clear?  

Yeah, I kind of understand what it is doing now, and the comments
will remind me when I start digging in this code again. Thanks.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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