[REVIEW][PATCH 1/4] vfs: Don't allow overwriting mounts in the current mount namespace

[Christoph Hellwig]

On Fri, Nov 08, 2013 at 02:17:31PM -0800, Eric W. Biederman wrote:
> > Read what you've written a few lines above.  The part about target->i_mutex
> > being held.
> 
> That works for the rename as unlink case but we don't hold
> old_dentry->d_inode->i_mutex which is what is needed to prevent a mount
> on the dentry we are renaming.

It will be held in 3.13.