[$] Taking ZUFS upstream

At the 2018 Linux Storage, Filesystem, and Memory-Management Summit(LSFMM), Boaz Harrosh introduced the ZUFSfilesystem. At this year's event, he was back to talk about what itwould take to merge ZUFS into the mainline. ZUFS, which Harrosh pronouncedas both "zoo-eff-ess"and "zoofs", has been running in production for his employer's (NetApp's) customers for some time now, so he wondered if it was something that couldgo upstream.