Question on huge_file

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I apologize if this is a dumb question, but I'm having trouble
understanding the huge_file superblock flag.

I see how, if this flag is set, that the inode can have a size > 2**32
bytes, using the i_size_lo/i_size_high fields.

But since an ext4_extent only uses 32-bits for for its ee_block field
to represent the logical block, how can an extent describe any block
range of a file past the 4GiB boundary?

Am I missing something?

Thanks,
Curt
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