[Btrfs-devel] btrfs timeline - fragmentation and delayed allocation

[sftf]

CM> Hi,

CM> Btrfs supports delayed allocation already, its the main method for file
CM> IO.  It is currently possible to do online defrag of the Btree and of
CM> files.

CM> We don't yet have very good fragmentation analysis tools.

CM> -chris

That's good!
And two more questions, please::
- what degree (very low, low, medium or hight) of a fragmentation we can expect from btrfs (now, in future)?
- how (meta)data's safety and integrity affected by btrfs's delayed allocation in case OS/hardware crash?