| 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 |
