linux-kernel - Re: [Cluster-devel] [RFC PATCH] dlm: Remove unused conf from lm

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Date:	Tue, 1 Jul 2014 12:22:13 -0500
From:	David Teigland <teigland@...hat.com>
To:	Bob Peterson <rpeterso@...hat.com>
Cc:	Jeff Layton <jlayton@...chiereds.net>, cluster-devel@...hat.com,
	linux-nfs@...r.kernel.org,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	linux-kernel@...r.kernel.org,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-fsdevel@...r.kernel.org, Joe Perches <joe@...ches.com>
Subject: Re: [Cluster-devel] [RFC PATCH] dlm: Remove unused conf from lm_grant

On Tue, Jul 01, 2014 at 01:16:32PM -0400, Bob Peterson wrote:
> ----- Original Message -----
> > On Tue, Jul 01, 2014 at 10:43:13AM -0400, Jeff Layton wrote:
> > > On Tue, 01 Jul 2014 06:20:10 -0700
> > > Joe Perches <joe@...ches.com> wrote:
> > > 
> > > > While doing a bit of adding argument names to fs.h,
> > > > I looked at lm_grant and it seems the 2nd argument
> > > > is always NULL.
> > > > 
> > > > How about removing it?
> > > > 
> > > > This doesn't apply as it depends on some other patches
> > > > but it should be clear enough...
> > > > 
> > > 
> > > ACK on the general idea from my standpoint. Anything that simplifies
> > > the file locking interfaces is a good thing, particularly the deferred
> > > locking code.
> > 
> > Fine with me.  I'd be happy to remove all the deferred locking code from
> > dlm; it never really worked.

> GFS2 uses deferred locks, at the very least in its direct_io path
> (gfs2_direct_IO in aops.c). So AFAIK we can't remove THAT without a certain
> amount of pain. Steve is on vacation / holiday this week, but he will
> be back on Thursday and Friday (which is a holiday).

This is about deferred file locks from NFS, not gfs2's "deferred" lock mode.
Dave

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