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 (0.0% non-contiguous), 570/2048 blocks
Exit status is 0
debugfs: ex /a
Level Entries       Logical      Physical Length Flags
 0/ 0   1/  1     0 -   511  1025 -  1536    512