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Message-ID: <alpine.LFD.2.00.1001071731440.7821@localhost.localdomain> Date: Thu, 7 Jan 2010 17:35:14 -0800 (PST) From: Linus Torvalds <torvalds@...ux-foundation.org> To: Trond Myklebust <Trond.Myklebust@...app.com> cc: Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org Subject: Re: [GIT PULL] Please pull NFS client bugfixes.... On Thu, 7 Jan 2010, Linus Torvalds wrote: > > However, I still suspect that the lock inversion problem can probably be > fixed without any of that at all. Maybe you can just break the chain > somewhere else. I've not actually seen the lockdep chain, so I don't know > the deails. Pointers? For example, if we're talking about readdir having a lock the other way (NFS lock taken before the mmap_sem), it's entirely possible that there is nothing to "fix" but some lockdep annotation. You cannot mmap a directory (and you can't readdir a non-directory), so if it's a per-inode NFS lock, then the simplest fix _might_ be to just put directory locks in a different lockdep class from non-directory locks. That might fix it. Of course, if it's not a per-inode lock, that doesn't help. And maybe I'm missing something entirely, and such games with lockdep classes are pointless, and I'm a moron. Quite possible. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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