Glibc and the kernel user-space API

I'm currently experimenting with the Ceph distributed filesystem, which can make use of "syncfs" if it's available. I'm running a kernel that supports syncfs (The ElRepo kernel-ml-3.7.5-1), but on a distribution (CentOS 6.3) that doesn't have a glibc that knows about this function. It would be nifty if the kernel came with a "liblinux" that implemented things like this, instead of the daunting (non-starter, really) prospect of upgrading to a new glibc just to get syncfs.