linux-kernel - Re: [PATCH 0/3] Fixes for vfs-scale and vfs-automount

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Message-ID: <20110224191012.GC22723@ZenIV.linux.org.uk>
Date:	Thu, 24 Feb 2011 19:10:13 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Ian Kent <raven@...maw.net>
Cc:	Trond Myklebust <Trond.Myklebust@...app.com>,
	David Howells <dhowells@...hat.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	npiggin@...il.com
Subject: Re: [PATCH 0/3] Fixes for vfs-scale and vfs-automount

On Thu, Feb 24, 2011 at 06:07:33PM +0800, Ian Kent wrote:

> Yes, that's a problem.
> 
> Previously the dcache_lock would have blocked on the dput() ... mmm, I'd
> missed that so far, although Nick didn't talk with me about his changes
> very much at all and I didn't pay enough attention to his patch series
> along the way, oops!

Actually, dcache_lock blocks only the _final_ dput().  I.e. one that has
refcount going to 0.  Not the case here, so that's a problem without
RCU stuff as well.
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