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btrfs on openSUSE not releasing disk space

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http://unix.stackexchange.com – I have an openSUSE 12.1 install on my main desktop running with btrfs filesystem for root (/boot is ext4). I started having issues today with KDE informing me that disk space is almost all gone and eventually it decided it was gone and crashed my desktop. I used Alt+F1 to switch to a terminal screen and although I was sure I was no where near the 1TB limit of my hard disk I moved some 150/200GB of music and video files onto an external drive and rebooted. Didn't help, same problem, same crash. Once more I switched to a terminal screen and used du to confirm that I had indeed only used about (HowTos)