Current Quantal's alternate image doesn't seem to have a btrfs on it. (??)
If I try to mount that partition from Quantal, it fails with:
BUG: Bad page state in process btrfs-cache-1 pn:2187fb
page:ffffea000.... count:0 mapcount:0 mapping:ffff88021... index:0x36e9
page flags: 0x2000...010c(referenced|uptodate|owner_priv_1)
Current Quantal's alternate image doesn't seem to have a btrfs on it. (??)
If I try to mount that partition from Quantal, it fails with:
BUG: Bad page state in process btrfs-cache-1 pn:2187fb ffff88021. .. index:0x36e9 ..010c( referenced| uptodate| owner_priv_ 1)
page:ffffea000.... count:0 mapcount:0 mapping:
page flags: 0x2000.
That's kernel 3.5.0-14-generic #15-Ubuntu