> This al under debian  with kernel 2.6.32-5.

  Aargh.

  You are aware that this is an *insanely* old version of the brtfs
code, and it has *major* flaws in it? Specifically, it doesn't deal
with out-of-space errors at all well, it doesn't have proper space
accounting (current kernels don't quite get it right all the time,
either, but they're orders of magnitude better at it), and there's
dozens of known bugs that can lead to your filesystem breaking.

  As far as btrfs goes, this kernel is so old, even the vultures have
given up on it, and the termites have picked the sun-bleached bones
clean and moved on...

  You need a new kernel *right now*.