Re: Linux 2.6.26-rc4

[Al Viro]

On Tue, Jun 03, 2008 at 12:45:33PM +0200, Miklos Szeredi wrote:

> I think it must be autofs4 doing something weird.  Like this in
> autofs4_lookup_unhashed():
> 
> 			/*
> 			 * Make the rehashed dentry negative so the VFS
> 			 * behaves as it should.
> 			 */
> 			if (inode) {
> 				dentry->d_inode = NULL;

Lovely.  If we ever step into that with somebody else (no matter who)
holding a reference to that dentry, we are certainly well and truly
buggered.  It's not just mount(2) - everything in the tree assumes that
holding a reference to positive dentry guarantees that it remains
positive.

Ian?
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