linux-kernel - Re: [PATCH v2] nfsd: Always lock state exclusively.

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Message-ID: <1465945026.12291.5.camel@poochiereds.net>
Date:	Tue, 14 Jun 2016 18:57:06 -0400
From:	Jeff Layton <jlayton@...chiereds.net>
To:	Oleg Drokin <green@...uxhacker.ru>
Cc:	"J . Bruce Fields" <bfields@...ldses.org>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] nfsd: Always lock state exclusively.

On Tue, 2016-06-14 at 18:54 -0400, Oleg Drokin wrote:
> On Jun 14, 2016, at 6:52 PM, Jeff Layton wrote:
> > 
> > I think I'd still prefer to have it unlock the mutex in the event that
> > it's not going to use it after all. While that kind of thing is ok for
> > now, it's stuff like that that can turn into a subtle source of bugs
> > later.
> > 
> > Also, I think I'd be more comfortable with this being split into (at
> > least) two patches. Do one patch as a straight conversion from rwsem to
> > mutex, and then another that changes the code to take the mutex before
> > hashing the new stateid.
> Ok, I guess that could be arranged too.
> 
> And then there's this Bruce's patch to pull more stuff into the init_open_stateid

Yeah, that seems like a good idea. We _really_ need an effort to
simplify this code. OPEN handling is always messy, but the current code
is really much messier than it should be.

-- 
Jeff Layton <jlayton@...chiereds.net>