732 	struct mountpoint *mp;  in lookup_mountpoint()  local
734 	hlist_for_each_entry(mp, chain, m_hash) {  in lookup_mountpoint()
735 		if (mp->m_dentry == dentry) {  in lookup_mountpoint()
739 			mp->m_count++;  in lookup_mountpoint()
740 			return mp;  in lookup_mountpoint()
749 	struct mountpoint *mp;  in new_mountpoint()  local
752 	mp = kmalloc(sizeof(struct mountpoint), GFP_KERNEL);  in new_mountpoint()
753 	if (!mp)  in new_mountpoint()
758 		kfree(mp);  in new_mountpoint()
762 	mp->m_dentry = dentry;  in new_mountpoint()
763 	mp->m_count = 1;  in new_mountpoint()
764 	hlist_add_head(&mp->m_hash, chain);  in new_mountpoint()
765 	INIT_HLIST_HEAD(&mp->m_list);  in new_mountpoint()
766 	return mp;  in new_mountpoint()
769 static void put_mountpoint(struct mountpoint *mp)  in put_mountpoint()  argument
771 	if (!--mp->m_count) {  in put_mountpoint()
772 		struct dentry *dentry = mp->m_dentry;  in put_mountpoint()
773 		BUG_ON(!hlist_empty(&mp->m_list));  in put_mountpoint()
777 		hlist_del(&mp->m_hash);  in put_mountpoint()
778 		kfree(mp);  in put_mountpoint()
847 			struct mountpoint *mp,  in mnt_set_mountpoint()  argument
850 	mp->m_count++;  in mnt_set_mountpoint()
852 	child_mnt->mnt_mountpoint = dget(mp->m_dentry);  in mnt_set_mountpoint()
854 	child_mnt->mnt_mp = mp;  in mnt_set_mountpoint()
855 	hlist_add_head(&child_mnt->mnt_mp_list, &mp->m_list);  in mnt_set_mountpoint()
863 			struct mountpoint *mp)  in attach_mnt()  argument
865 	mnt_set_mountpoint(parent, mp, mnt);  in attach_mnt()
866 	hlist_add_head_rcu(&mnt->mnt_hash, m_hash(&parent->mnt, mp->m_dentry));  in attach_mnt()
1556 	struct mountpoint *mp;  in __detach_mounts()  local
1560 	mp = lookup_mountpoint(dentry);  in __detach_mounts()
1561 	if (IS_ERR_OR_NULL(mp))  in __detach_mounts()
1565 	while (!hlist_empty(&mp->m_list)) {  in __detach_mounts()
1566 		mnt = hlist_entry(mp->m_list.first, struct mount, mnt_mp_list);  in __detach_mounts()
1574 	put_mountpoint(mp);  in __detach_mounts()
1964 		struct mountpoint *mp = lookup_mountpoint(dentry);  in lock_mount()  local
1965 		if (!mp)  in lock_mount()
1966 			mp = new_mountpoint(dentry);  in lock_mount()
1967 		if (IS_ERR(mp)) {  in lock_mount()
1970 			return mp;  in lock_mount()
1972 		return mp;  in lock_mount()
1990 static int graft_tree(struct mount *mnt, struct mount *p, struct mountpoint *mp)  in graft_tree()  argument
1995 	if (d_is_dir(mp->m_dentry) !=  in graft_tree()
1999 	return attach_recursive_mnt(mnt, p, mp, NULL);  in graft_tree()
2075 	struct mountpoint *mp;  in do_loopback()  local
2087 	mp = lock_mount(path);  in do_loopback()
2088 	err = PTR_ERR(mp);  in do_loopback()
2089 	if (IS_ERR(mp))  in do_loopback()
2120 	err = graft_tree(mnt, parent, mp);  in do_loopback()
2127 	unlock_mount(mp);  in do_loopback()
2238 	struct mountpoint *mp;  in do_move_mount()  local
2246 	mp = lock_mount(path);  in do_move_mount()
2247 	err = PTR_ERR(mp);  in do_move_mount()
2248 	if (IS_ERR(mp))  in do_move_mount()
2287 	err = attach_recursive_mnt(old, real_mount(path->mnt), mp, &parent_path);  in do_move_mount()
2295 	unlock_mount(mp);  in do_move_mount()
2331 	struct mountpoint *mp;  in do_add_mount()  local
2337 	mp = lock_mount(path);  in do_add_mount()
2338 	if (IS_ERR(mp))  in do_add_mount()
2339 		return PTR_ERR(mp);  in do_add_mount()
2363 	err = graft_tree(newmnt, parent, mp);  in do_add_mount()
2366 	unlock_mount(mp);  in do_add_mount()