bypass | GlusterFS translator to bypass AFR

bypass is a C library. bypass has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

This is a proof-of-concept translator for an idea that was proposed at FUDcon 2012 in Blacksburg, VA. The idea is simply that we can forward writes only to local storage, bypassing AFR but setting the xattrs ourselves to indicate that self-heal is needed. This gives us near-local write speeds, and we can mount later without the bypass to force self-heal when it's convenient. We can do almost the same thing for reads as well. I've tried this and it seems to work, but there are some major caveats. The coolest direction to go here would be to put information about writes we've seen onto a queue, with a separate process listening on that queue to perform assynchronous but nearly immediate self-heal on just those files. As long as the other consistency issues are handled properly, this might be a really easy way to get near-local performance for virtual-machine-image use cases without introducing consistency/recovery nightmares.