mke2fs -F -T hugefile test.img 4T
Creating filesystem with 1073741824 4k blocks and 1048576 inodes
Superblock backups stored on blocks: 

Allocating group tables: done                            
Writing inode tables:            done                            
Creating 1 huge file(s) : done
Writing superblocks and filesystem accounting information:            done

Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

Exit status is 0
debugfs -R "extents /store/big-data" test.img | head
Level Entries                 Logical                Physical Length Flags
 0/ 2   1/  1          0 - 1073610751     131070              1073610752
 1/ 2   1/ 97          0 -   11108351     131071              11108352
 2/ 2   1/339          0 -      32767     131072 -     163839  32768 
 2/ 2   2/339      32768 -      65535     163840 -     196607  32768 
 2/ 2   3/339      65536 -      98303     196608 -     229375  32768 
 2/ 2   4/339      98304 -     131071     229376 -     262143  32768 
 2/ 2   5/339     131072 -     163839     262144 -     294911  32768 
 2/ 2   6/339     163840 -     196607     294912 -     327679  32768 
 2/ 2   7/339     196608 -     229375     327680 -     360447  32768 
 2/ 2   8/339     229376 -     262143     360448 -     393215  32768 
 2/ 2   9/339     262144 -     294911     393216 -     425983  32768 
 2/ 2  10/339     294912 -     327679     425984 -     458751  32768 
 2/ 2  11/339     327680 -     360447     458752 -     491519  32768 
 2/ 2  12/339     360448 -     393215     491520 -     524287  32768 
 2/ 2  13/339     393216 -     425983     524288 -     557055  32768 
 2/ 2  14/339     425984 -     458751     557056 -     589823  32768 
 2/ 2  15/339     458752 -     491519     589824 -     622591  32768 
 2/ 2  16/339     491520 -     524287     622592 -     655359  32768