Btrfs: ignore orphan qgroup relations
If a qgroup that has still assignments is deleted by the user, the corresponding relations are left in the tree. This leads to an unmountable filesystem. With this patch, those relations are simple ignored. Reported-by: NEric Hopper <hopper@omnifarious.org> Signed-off-by: NArne Jansen <sensille@gmx.net> Signed-off-by: NChris Mason <chris.mason@fusionio.com>
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