It seems the same issue as I ran into some time ago. Check the following thread
on why it happens and how to get out of it.
http://thread.gmane.org/gmane.comp.file-systems.btrfs/3996/focus=4003
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The system is insisting I am out of disk space!
[r...@matrix tmp]# df -h /
FilesystemSize Used Avail Use% Mounted on
/dev/mapper/vgkimo-lvF12
26G 10G 16G 39% /
[r...@matrix tmp]# dd if=/dev/zero of=bigfile bs=1M count=500
dd: writing `bigfile': No space
More info
[r...@matrix ~]# btrfs-show
failed to read /dev/sr0
Label: none uuid: 06b0d069-b1cb-48c4-b26f-c5088a2360d2
Total devices 1 FS bytes used 9.99GB
devid1 size 25.72GB used 25.72GB path /dev/dm-1
Btrfs Btrfs v0.19
On Thu, Nov 26, 2009 at 11:47 PM, Ahmed Kamal