Btrfs: return gracefully from balance if fs tree is corrupted
When relocating tree blocks, we firstly get block information from back references in the extent tree, we then search fs tree to try to find all parents of a block. However, if fs tree is corrupted, eg. if there're some missing items, we could come across these WARN_ONs and BUG_ONs. This makes us print some error messages and return gracefully from balance. Signed-off-by:Liu Bo <bo.li.liu@oracle.com> Reviewed-by:
Josef Bacik <jbacik@fb.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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