fsync(2), fdatasync(2), posix_fadvise(2) and posix_fallocate(2)

I can't find a reason https://ghc.haskell.org/trac/ghc/ticket/8621 might have stalled but it seems like it has from my perspective. Can someone tell me I'm wrong or what to do to unstall it? This is very useful functionality that is actually part of IEEE Std 1003.1. -davean