implement reconstruct about cfs HOT 8 OPEN

@xiang90 looks like we need to hook up the server to initiate request to other servers for reconstruction right? looks like you've already hook up jerasure, perhaps I can help doing the calls part

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@tnachen Right. Basically we want to pull source files from other cfs nodes to /dev/shm (tmpfs), then reconstruct the target files onto disk.

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@xiang90 can you add me to the org? I can't assign myself this

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@tnachen We start to roll up the wheel again. Are you still working on this one?

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@yichengq hey good to know! I have a WIP patch in my repo that I can try to finish this few days. I forgot about this a bit and did other stuff, I have time to work on this now so I can look at it.

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@tnachen 👍

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@tnachen How is it going? I could work it with you if you meet problems with it. Or I can continue with your WIP patch too.

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@yichengq sorry got occupied again earlier :( I do have some time but I think it's safer to give it to you if you're more available, or we can even work together. Yes please take over from my WIP patch

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