btrfs: migrate the block group removal code
This is the removal code and the unused bgs code. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> [ refresh, move clear_incompat_bg_bits ] Signed-off-by: NDavid Sterba <dsterba@suse.com>
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