void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
struct vfsmount *);
void release_mounts(struct list_head *);
-void umount_tree(struct vfsmount *, int, struct list_head *);
+void umount_tree(struct mount *, int, struct list_head *);
struct mount *copy_tree(struct vfsmount *, struct dentry *, int);
bool is_path_reachable(struct vfsmount *, struct dentry *,
const struct path *root);