On Tue, 22 Aug 2017 17:45:37 +0200
Ulli Horlacher <frams...@rus.uni-stuttgart.de> wrote:
> In perl I have now:
>
> $root = $volume;
> while (`btrfs subvolume show "$root" 2>/dev/null` !~ /toplevel subvolume/) {
> $root = dirname($root);
> last if $root eq '/';
> }
>
>
If you are okay with rolling your own solutions like this, take a look at
"btrfs filesystem usage <path>". It will print the blockdevice used for
mounting the base FS. From that you can find the mountpoint via /proc/mounts.
Performance-wise it seems to work instantly on an almost full 2TB FS.
--
With respect,
Roman
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