ovl: disallow overlayfs as upperdir



This does not work and does not make sense.  So instead of fixing it
(probably not hard) just disallow.

Reported-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: <stable@vger.kernel.org>

parent 656189d2

fs/overlayfs/super.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -407,7 +407,8 @@ static struct ovl_entry *ovl_alloc_entry(unsigned int numlower)
		static bool ovl_dentry_remote(struct dentry *dentry)
		{
		return dentry->d_flags &
		(DCACHE_OP_REVALIDATE \| DCACHE_OP_WEAK_REVALIDATE);
		(DCACHE_OP_REVALIDATE \| DCACHE_OP_WEAK_REVALIDATE \|
		DCACHE_OP_REAL);
		}

		static bool ovl_dentry_weird(struct dentry *dentry)