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If the problem is anything like this:

https://www.reddit.com/r/btrfs/comments/fcntc6/qcow2_on_btrf...

You can either make a sub volume and mount it with nocow or set the +C file attribute to disable CoW:

http://blog.jim.nz/2015/12/04/btrfs-subvolume-with-nocow.htm...

Doesn’t really look like nilfs2 has this kind of flexibility, though

Yeah. i mean just due to continuous snapshots. Otherwise i don't really trust it that much. It's like this outsider kid which is kinda cool. But still needs to grow up and sell it :-D

It’s basically append-only for recent things so you theoretically you can’t lose anything (within a reasonable timeframe). I don’t know if the porcelain exposes everything you need to avail yourself of that design functionality, though.