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
test_filesys: 12/128 files (8.3% non-contiguous), 26/512 blocks
Exit status is 0
debugfs: ex /a
Level Entries       Logical      Physical Length Flags
 0/ 1   1/  1     0 -    21     9             22
 1/ 1   1/  7     0 -     0    10 -    10      1 
 1/ 1   2/  7    11 -    11   100 -   100      1 
 1/ 1   3/  7    13 -    13   101 -   101      1 
 1/ 1   4/  7    15 -    15   102 -   102      1 
 1/ 1   5/  7    17 -    17   103 -   103      1 
 1/ 1   6/  7    19 -    19   104 -   104      1 
 1/ 1   7/  7    21 -    21   105 -   105      1