Just to track the work of a working fsck upstream.
info update... btw, according to phoronix (i know, -so- reliable), Mid February, this 2012, btrfs-fsck is slated for. hopefully time will lead to this then.. http://www.phoronix.com/scan.php?page=news_item&px=MTA0Njk
The btrfsck tool in the git master branch for btrfs-progs is now capable of repairing some types of filesystem breakage. It is not well-tested in real-life situations yet. If you have a broken filesystem, it is probably better to use btrfsck with advice from one of the btrfs developers, just in case something goes wrong. (But even if it does go badly wrong, you've still got your backups, right?) Note that there is also a recovery tool in the btrfs-progs git repository which can often be used to copy essential files out of broken filesystems. http://btrfs.ipv5.de/index.php?title=FAQ#When_will_Btrfs_have_a_fsck_like_tool.3F
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle. Changing version to '19'. (As we did not run this process for some time, it could affect also pre-Fedora 19 development cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.) More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19
FSVO "works" there isa btrfsck now. Should this be closed?