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

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Message-ID: <20120608005935.GL30000@ZenIV.linux.org.uk>
Date:	Fri, 8 Jun 2012 01:59:35 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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 Fri, Jun 08, 2012 at 01:36:04AM +0100, Al Viro wrote:
> Eric, how about this - if nothing else, that makes code in there simpler
> and less dependent on details of VFS guts:

Argh.  No, it's not enough.  Why are you using ->d_iput()?  You are not
doing anything unusual with inode; the natural place for that is in
->d_release() and then it will get simpler rules wrt setting ->d_fsdata.
As it is, you need to do that exactly after the point where you know
that it dentry won't be dropped without going through d_add().

OK, I've split that in two commits and put into vfs.git#sysfs; take a look
and comment, please.  Should get to git.kernel.in a few...
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