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I have a btrfs volume that formally had a bunch of read-only subvolumes stored on it.

I deleted them all. There's no files and no subvolumes, but still no free space.

I tried syncing, still no free space.

I tried btrfs balance. That does not appear to be doing anything and the userspace process is stuck in uninterruptible disk sleep. I tried btrfs balance cancel. Now that process is stuck in disk sleep too. Still no free space.

Any suggestions? Should I just reboot and reformat the volume?

Lawrence D'Anna
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1 Answers1

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Could it be that you have other volumes above what you have mounted at / or whatever? What about snapshots?

You could use a tool like btdu to check what's actually happening on a btrfs volume.

부비Dan
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  • thanks, I tried letting btrfs balance run all night, and it did manage to reclaim the space. So I guess that's the "solution", although I don't love it. – Lawrence D'Anna Feb 05 '24 at 21:18