Description of problem:
If tp-logger is writing to a btrfs oartition, tha system becomes unusable, as tp-logger seems to be "mis"using the sync or fsync (this is just  a guess).

Version-Release number of selected component (if applicable):
F14/F15

How reproducible:
Always

Steps to Reproduce:
1. Install F15 with /home on btrfs
2. Run empathy, join a room and let people write, so the logger logs to somewhere
3.
  
Actual results:
The system is getting slow.

Expected results:
The system is running fine.

Additional info: