[$] Taking ZUFS upstream

At the 2018 Linux Storage, Filesystem, and Memory-Management Summit
(LSFMM), Boaz Harrosh introduced the ZUFS
filesystem. At this year's event, he was back to talk about what it
would take to merge ZUFS into the mainline. ZUFS, which Harrosh pronounced
as 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 could
go upstream.