linux-kernel - Re: Linux 2.6.26-rc4

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Date:	Tue, 3 Jun 2008 09:59:50 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...IV.linux.org.uk>
cc:	Ian Kent <raven@...maw.net>, Miklos Szeredi <miklos@...redi.hu>,
	jesper@...gh.cc, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: Linux 2.6.26-rc4



On Tue, 3 Jun 2008, Al Viro wrote:
> > 
> > If the dentry is unhashed, it means that it _either_
> > 
> >  - has already been deleted (rmdir'ed) or d_invalidate()'d. Right?
> > 
> >    I don't see why you should ever return the dentry in this case..
> 
> From my reading of that code looks like it's been rmdir'ed.  And no, I
> don't understand what the hell is that code trying to do.

Hmm. Looking closer, I think that code is meant to handle the 
d_invalidate() that it did in autofs4_tree_busy().

However, that should never trigger for a directory entry that can be 
reached some other way, because that code has done a "dget()" on the 
dentry, and d_invalidate() does

	if (atomic_read(&dentry->d_count) > 1) {
		if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
			..unlock..
			return -EBUSY;
		}
	}

so I dunno. I still think the expire code shouldn't even use 
d_invalidate() at all, and just revalidate() at lookup. 

		Linus
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