2467 static void swap_names(struct dentry *dentry, struct dentry *target)  in swap_names()  argument
2469 	if (unlikely(dname_external(target))) {  in swap_names()
2474 			swap(target->d_name.name, dentry->d_name.name);  in swap_names()
2480 			memcpy(target->d_iname, dentry->d_name.name,  in swap_names()
2482 			dentry->d_name.name = target->d_name.name;  in swap_names()
2483 			target->d_name.name = target->d_iname;  in swap_names()
2491 			memcpy(dentry->d_iname, target->d_name.name,  in swap_names()
2492 					target->d_name.len + 1);  in swap_names()
2493 			target->d_name.name = dentry->d_name.name;  in swap_names()
2502 			kmemcheck_mark_initialized(target->d_iname, DNAME_INLINE_LEN);  in swap_names()
2505 				     ((long *) &target->d_iname)[i]);  in swap_names()
2509 	swap(dentry->d_name.hash_len, target->d_name.hash_len);  in swap_names()
2512 static void copy_name(struct dentry *dentry, struct dentry *target)  in copy_name()  argument
2517 	if (unlikely(dname_external(target))) {  in copy_name()
2518 		atomic_inc(&external_name(target)->u.count);  in copy_name()
2519 		dentry->d_name = target->d_name;  in copy_name()
2521 		memcpy(dentry->d_iname, target->d_name.name,  in copy_name()
2522 				target->d_name.len + 1);  in copy_name()
2524 		dentry->d_name.hash_len = target->d_name.hash_len;  in copy_name()
2530 static void dentry_lock_for_move(struct dentry *dentry, struct dentry *target)  in dentry_lock_for_move()  argument
2535 	if (IS_ROOT(dentry) || dentry->d_parent == target->d_parent)  in dentry_lock_for_move()
2536 		spin_lock(&target->d_parent->d_lock);  in dentry_lock_for_move()
2538 		if (d_ancestor(dentry->d_parent, target->d_parent)) {  in dentry_lock_for_move()
2540 			spin_lock_nested(&target->d_parent->d_lock,  in dentry_lock_for_move()
2543 			spin_lock(&target->d_parent->d_lock);  in dentry_lock_for_move()
2548 	if (target < dentry) {  in dentry_lock_for_move()
2549 		spin_lock_nested(&target->d_lock, 2);  in dentry_lock_for_move()
2553 		spin_lock_nested(&target->d_lock, 3);  in dentry_lock_for_move()
2557 static void dentry_unlock_for_move(struct dentry *dentry, struct dentry *target)  in dentry_unlock_for_move()  argument
2559 	if (target->d_parent != dentry->d_parent)  in dentry_unlock_for_move()
2561 	if (target->d_parent != target)  in dentry_unlock_for_move()
2562 		spin_unlock(&target->d_parent->d_lock);  in dentry_unlock_for_move()
2563 	spin_unlock(&target->d_lock);  in dentry_unlock_for_move()
2592 static void __d_move(struct dentry *dentry, struct dentry *target,  in __d_move()  argument
2598 	BUG_ON(d_ancestor(dentry, target));  in __d_move()
2599 	BUG_ON(d_ancestor(target, dentry));  in __d_move()
2601 	dentry_lock_for_move(dentry, target);  in __d_move()
2604 	write_seqcount_begin_nested(&target->d_seq, DENTRY_D_LOCK_NESTED);  in __d_move()
2613 	__d_rehash(dentry, d_hash(target->d_parent, target->d_name.hash));  in __d_move()
2619 	__d_drop(target);  in __d_move()
2621 		__d_rehash(target,  in __d_move()
2627 		swap_names(dentry, target);  in __d_move()
2629 		copy_name(dentry, target);  in __d_move()
2635 		dentry->d_parent = target->d_parent;  in __d_move()
2636 		target->d_parent = target;  in __d_move()
2637 		list_del_init(&target->d_child);  in __d_move()
2641 		swap(dentry->d_parent, target->d_parent);  in __d_move()
2642 		list_move(&target->d_child, &target->d_parent->d_subdirs);  in __d_move()
2645 			fsnotify_d_move(target);  in __d_move()
2649 	write_seqcount_end(&target->d_seq);  in __d_move()
2652 	dentry_unlock_for_move(dentry, target);  in __d_move()
2664 void d_move(struct dentry *dentry, struct dentry *target)  in d_move()  argument
2667 	__d_move(dentry, target, false);  in d_move()