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Re: [PATCH] Add the .MASTER node to the eth-multiplexer.

From: Sergiu Ivanov
Subject: Re: [PATCH] Add the .MASTER node to the eth-multiplexer.
Date: Thu, 24 Dec 2009 19:13:57 +0200
User-agent: Mutt/1.5.20 (2009-06-14)


On Thu, Dec 24, 2009 at 05:52:48PM +0800, Da Zheng wrote:
> Sergiu Ivanov wrote:
> > On Wed, Dec 23, 2009 at 08:52:33AM +0800, Da Zheng wrote:
> >> netfs_attempt_lookup locks this node and the node is unlocked by
> >> libnetfs, right? I forget a lot:-) So why can the second lookup not
> >> wait until the first one finishes?
> > 
> > I've tried to remove the mutex unlocking code and it seems to work.
> > So, you are right :-)
> You mean there isn't deadlock at all?

Yeah, it looks like that.

> > I wonder whether not locking .MASTER is still relevant.  On the one
> > hand, it would stress its conceptual authenticity; on the other hand,
> > it would require additional code to achieve the same functionality.
> If the code can work without unlocking .MASTER as you said above,
> that means libnetfs unlocks it, then we should lock .MASTER before
> netfs_attempt_lookup returns.

Ah, true.  I have forgotten that minor detail :-( So I'll remove the
code for locking .MASTER.


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