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 : 7638 17 183 [ 8 5 11 9 3 3 3 2 5 1 1 2 0 0 ]
#2 : 13118 29 6871 [ 12 13 16 19 2 1 2 1 3 3 2 2 1 0 ]
#3 : 24976 3 129 [ 2 1 1 1 2 1 1 0 1 2 1 3 2 1 ]
#4 : 15003 5 8192 [ 1 1 2 2 0 0 2 0 2 0 0 3 0 1 ]
#5 : 1904 3 129 [ 2 3 2 4 4 4 2 2 1 2 0 0 0 0 ]
#6 : 10096 4 5098 [ 2 3 2 2 1 2 2 1 0 1 1 0 0 1 ]
#7 : 32639 1 129 [ 1 1 1 1 1 1 1 0 1 1 1 1 1 3 ]