btrfs: move basic block_group definitions to their own header
This is prep work for moving all of the block group cache code into its own file. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> [ minor comment updates ] Signed-off-by: David Sterba <dsterba@suse.com>
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fs/btrfs/block-group.h
0 → 100644
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