linux-kernel - Re: processes hung after sys_renameat, and 'missing' processes

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Message-ID: <CA+55aFwvtdJsFEit4N3OVKZH2jpvxnB9843nhQeqGu99aUOQpw@mail.gmail.com>
Date:	Thu, 7 Jun 2012 17:42:02 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Miklos Szeredi <mszeredi@...e.cz>, Jan Kara <jack@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org,
	"J. Bruce Fields" <bfields@...hat.com>,
	Sage Weil <sage@...dream.net>
Subject: Re: processes hung after sys_renameat, and 'missing' processes

On Thu, Jun 7, 2012 at 5:36 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Frankly, I would very much prefer to have the same locking rules wherever
> possible.  The locking system is already overcomplicated and making its
> analysis fs-dependent as well... <shudder>

I do agree that it would be better if we avoid it. I was just trying
to explain that the dentry locking is *not* enough, for the simple
reason that it relies on upper-level non-dentry locking just to work.

Your patch looks good, but whether it works I have no idea ;)

               Linus
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