ovl: fix working on distributed fs as lower layer

This adds missing .d_select_inode into alternative dentry_operations.

Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Fixes: 7c03b5d45b8e ("ovl: allow distributed fs as lower layer")
Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay")
Reviewed-by: Nikolay Borisov <kernel@kyup.com>
Tested-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: <stable@vger.kernel.org> # 4.2+

fs/overlayfs/super.c

@@ -341,6 +341,7 @@ static const struct dentry_operations ovl_dentry_operations = {
 
 static const struct dentry_operations ovl_reval_dentry_operations = {
 	.d_release = ovl_dentry_release,
+	.d_select_inode = ovl_d_select_inode,
 	.d_revalidate = ovl_dentry_revalidate,
 	.d_weak_revalidate = ovl_dentry_weak_revalidate,
 };