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.)
btrfs filesystem df /subvol
?btrfs filesystem df /
(the command called on the root of the btrfs file system). I should add that the version of my userspace tools isv0.20-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.