File: //proc/fs/ext4/sda1/mb_groups
#group: free frags first [ 2^0 2^1 2^2 2^3 2^4 2^5 2^6 2^7 2^8 2^9 2^10 2^11 2^12 2^13 ]
#0 : 19058 38 576 [ 26 16 6 8 10 10 2 3 2 2 2 3 2 0 ]
#1 : 18980 15 552 [ 0 2 4 2 6 5 2 5 4 3 5 3 1 0 ]
#2 : 2207 34 496 [ 19 16 13 17 13 3 2 2 5 0 0 0 0 0 ]
#3 : 8890 28 560 [ 12 13 13 10 13 2 4 2 3 2 4 1 0 0 ]
#4 : 3479 11 490 [ 1 3 2 1 4 4 5 3 2 0 2 0 0 0 ]
#5 : 24743 5 552 [ 1 1 1 4 2 1 3 1 1 1 1 1 1 2 ]
#6 : 24748 25 493 [ 4 10 11 9 16 5 4 7 4 5 5 3 2 0 ]
#7 : 19928 1 552 [ 0 0 0 1 1 0 1 1 1 0 1 1 2 1 ]