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Is there a command to get the on-disk size of a btrfs subvolume?

The file system was mounted with -o compressed and the subvolume contains a lot of files that should compress rather well. I could use du on the root folder but then I will only get the sum of the uncompressed sizes and it is also relatively slow compared to a df-like command.

(Note: This question is not about the size of the unique data contained in this subvolume and how much it derived from other snapshots in a COW fashion.)

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  • What abouit btrfs filesystem df /subvol ?
    – ek9
    May 10, 2014 at 17:51
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    @edvinas.me: Nope, it shows me the same output as btrfs filesystem df / (the command called on the root of the btrfs file system). I should add that the version of my userspace tools is v0.20-rc1 and that I use the current Ubuntu 13.10 kernel (3.11.0-20-generic #35-Ubuntu), though I don't want to narrow the question down to old versions if it is possible in current or future releases.
    – Perseids
    May 10, 2014 at 22:45

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I can't help with the compressed size, but enabling quotas seems to be the only way to see how much space is us ed by a subvolume.

See : http://dustymabe.com/2013/09/22/btrfs-how-big-are-my-snapshots/

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