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 : 3003 17 180 [ 7 6 12 7 4 4 6 4 7 0 0 0 0 0 ]
#2 : 4808 17 6871 [ 8 8 8 6 0 3 0 0 2 0 0 0 1 0 ]
#3 : 10970 4 778 [ 0 3 1 0 1 4 1 2 1 2 1 0 0 1 ]
#4 : 2683 2 8192 [ 1 1 0 1 1 1 1 0 0 1 0 1 0 0 ]
#5 : 17860 4 896 [ 0 0 1 0 0 0 1 1 1 0 1 2 1 1 ]
#6 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
#7 : 32639 1 129 [ 1 1 1 1 1 1 1 0 1 1 1 1 1 3 ]