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by andfarm 5462 days ago
aufs isn't mainline, and will probably never be mainline, because it's ~27,000 lines of poorly documented and often buggy code, written by a single maintainer in a style that doesn't really mesh with the rest of the kernel.

Speaking from experience, there are a lot of edge-case bugs remaining in aufs. It's usable enough for livecds and whatnot, but trying to use it on a server is a recipe for disaster.