rem: return vfs_rename(buf1, buf2, true);
add: return common_rename(buf1, buf2, true);
context: sys_rename(const char *oldpath, const char *newpath){	char buf1[SYS_MAX_PATH_LEN+1];	char buf2[SYS_MAX_PATH_LEN+1];	strncpy(buf1, oldpath, SYS_MAX_PATH_LEN);	buf1[SYS_MAX_PATH_LEN] = 0;	strncpy(buf2, newpath, SYS_MAX_PATH_LEN);	buf2[SYS_MAX_PATH_LEN] = 0;	return vfs_rename(buf1, buf2, true);}