btrfs: migrate the block group lookup code
Move these bits first as they are the easiest to move. Export two of the helpers so they can be moved all at once. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> [ minor style updates ] Signed-off-by: NDavid Sterba <dsterba@suse.com>
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fs/btrfs/block-group.c
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