rem: return ERR_VM_BAD_USER_MEMORY;
add: return B_BAD_ADDRESS;
context: user_create_dir_entry_ref(dev_t device, ino_t inode, const char *uname, int perms){	char name[B_FILE_NAME_LENGTH];	int status;	if (!CHECK_USER_ADDRESS(uname))		return ERR_VM_BAD_USER_MEMORY;	status = user_strncpy(name, uname, sizeof(name) - 1);	if (status < 0)		return status;	name[sizeof(name) - 1] = '\0';	return dir_create_entry_ref(device, inode, name, perms, false);}