On 02.01.2012 16:01, Daniel Pocock wrote:

One thing I've already noticed in 2.6.39 (and both versions of the
tools) is that df results are misleading.  E.g. if I run regular df (not
btrfs fi df), I am seeing the same amount of available space for all
filesystems.  Is there currently a way to see space used by each
subvolume and snapshot and which kernel and tools versions might be needed?

If you're interested (and brave), you might give the subvolume quota
patches a try. Arne sent them last October, subject

   [PATCH v0 00/18] btfs: Subvolume Quota Groups

Be warned that this is a v0 patch, it's not been tested too much and
will very likely be reworked in the future. But that kind of
functionality will hopefully be added to btrfs, consequently.

-Jan