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 : 1473 14 184 [ 7 7 7 4 3 2 2 1 4 0 0 0 0 0 ]
#2 : 6679 21 6871 [ 11 14 4 6 1 1 2 2 2 1 1 0 1 0 ]
#3 : 14605 4 741 [ 3 1 0 3 3 2 2 2 3 0 1 4 1 0 ]
#4 : 15600 2 9216 [ 0 0 0 0 1 1 1 1 0 0 1 1 1 1 ]
#5 : 7795 3 813 [ 1 1 0 2 2 0 3 1 1 0 1 1 1 0 ]
#6 : 25210 1 7558 [ 0 1 0 1 1 1 1 0 0 1 0 0 0 3 ]
#7 : 32639 1 129 [ 1 1 1 1 1 1 1 0 1 1 1 1 1 3 ]