btrfs mounts as read-only

yesterday btrfs was complaining about empty space so i booted into a livecd removed some pkgmanager cache and some snapshots and rebooted but while rebooting the init couldn't unmount the filesystem (it tried for some minutes) so it just ignored it now when i boot i get
http://bpaste.net/show/120045/ in dmesg,the filesystem get mounted as readonly