If 'btrfs_file_extent_item' can contain the ref count it would
 solve the current problem quite easily.  (problem is that, its
 of n * n searches to know data extents with its ref for a given
 subvol).

 But what'r the challenge(s) to have ref count in the
 btrfs_file_extent_item ? any thoughts ?

Thanks, Anand
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