Btrfs: add helpers for read-only compat bits
We're finally going to add one of these for the free space tree, so let's add the same nice helpers that we have for the incompat bits. While we're add it, also add helpers to clear the bits. Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NOmar Sandoval <osandov@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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