linux-kernel - Re: [PATCH 4/4] nfsd4: initialize delegation pointer to lease

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Date:	Sat, 30 Oct 2010 23:04:44 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"J. Bruce Fields" <bfields@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Bryan Schumaker <bjschuma@...app.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] nfsd4: initialize delegation pointer to lease

On Sat, Oct 30, 2010 at 10:04:31PM -0400, Christoph Hellwig wrote:
> On Sat, Oct 30, 2010 at 05:31:16PM -0400, J. Bruce Fields wrote:
> > The NFSv4 server was initializing the dp->dl_flock pointer by the
> > somewhat ridiculous method of a locks_copy_lock callback.
> > 
> > Now that setlease uses the passed-in lock instead of doing a copy,
> > dl_flock no longer gets set, resulting in the lock leaking on delegation
> > release, and later possible hangs (among other problems).
> > 
> > So, initialize dl_flock and get rid of the callback.
> 
> >From what I can see this was the only instance of 
> lock_manager_operations.fl_copy_lock.  Please kill it while you're at
> it.
> 
> Also lock_manager_operations.fl_release_private has only exact one
> instance in nfs4d which is part of the same abuse scheme.  Please also
> get rid of it.   I recently noticed this while updating
> Documentation/filesystems/Locking for the grand new BKL-less world.

Yeah, I wanted to maximize chances of getting the minimal fixes into
-rc1, but I've got patches for that queued up too.  I was planning on
waiting for the next merge window, but I'm happy enough to send them in
now.

--b.
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