btrfs: extent-tree: Use btrfs_ref to refactor add_pinned_bytes()
Since add_pinned_bytes() only needs to know if the extent is metadata and if it's a chunk tree extent, btrfs_ref is a perfect match for it, as we don't need various owner/level trick to determine extent type. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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