[jhalstead]

Seems like Facebook uses it:

"Btrfs has played a role in increasing efficiency and resource utilization in Facebook’s data centers in a number of different applications. Recently, Btrfs helped eliminate priority inversions caused by the journaling behavior of the previous filesystem, when used for I/O control with cgroup2 (described below). Btrfs is the only filesystem implementation that currently works with resource isolation, and it’s now deployed on millions of servers, driving significant efficiency gains."

https://engineering.fb.com/open-source/linux/

[alexgartrell]

Yeah there are a remarkable set of container runtime tasks (package downloads, rootfs creation and management, etc) that are way easier with btrfs. It wasn’t always smooth sailing but luckily Chris, Josef, Omar and others are awesome and now (and for the last while) we are asking for features rather than fixes.