rem: int rc;
add: int status;
context: user_unmount(const char *upath){	char path[SYS_MAX_PATH_LEN + 1];	int rc;	rc = user_strncpy(path, upath, SYS_MAX_PATH_LEN);	if (rc < 0)		return rc;	path[SYS_MAX_PATH_LEN] = 0;	return fs_unmount(path, false);}