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 : 28511 1 4257 [ 1 1 1 1 1 0 1 0 1 1 1 1 0 3 ]
#1 : 3617 19 180 [ 11 11 12 14 6 6 7 5 8 0 0 0 0 0 ]
#2 : 6018 31 6871 [ 14 20 19 10 1 1 2 2 3 1 0 2 0 0 ]
#3 : 13887 11 129 [ 5 7 7 6 6 4 4 4 2 0 0 2 2 0 ]
#4 : 1701 2 9938 [ 1 2 2 1 1 2 1 0 2 0 1 0 0 0 ]
#5 : 17423 3 1542 [ 1 1 1 1 2 1 1 1 1 1 0 2 1 1 ]
#6 : 17446 2 7661 [ 2 2 0 0 2 0 0 0 0 2 0 0 0 2 ]
#7 : 32639 1 129 [ 1 1 1 1 1 1 1 0 1 1 1 1 1 3 ]