Function inline_ref_size 

pub fn inline_ref_size(type_byte: u8) -> Option<usize>

On-disk size in bytes of an inline backref record (including its 1-byte type tag) for a given inline ref type byte.

Returns None if type_byte is not a recognized inline ref type.

• TREE_BLOCK_REF/EXTENT_OWNER_REF: 1 (tag) + 8 (root) = 9
• SHARED_BLOCK_REF: 1 (tag) + 8 (parent) = 9
• EXTENT_DATA_REF: 1 (tag) + 28 (btrfs_extent_data_ref) = 29
• SHARED_DATA_REF: 1 (tag) + 8 (parent) + 4 (count) = 13