[$] Btrfs at Facebook

The Btrfs filesystem has had a long and sometimes turbulent history; LWNfirst wrote about it in 2007. It offersfeatures not found in any other mainline Linux filesystem, but reliabilityand performance problems have prevented its widespread adoption. There is atleast one company that is using Btrfs on a massive scale, though:Facebook. At the 2020Open Source Summit North America virtual event, Btrfs developer JosefBacik described why and how Facebook has invested deeply in Btrfs and where the remainingchallenges are.