File: //proc/fs/ext4/sdh/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 : 28012 2 4247 [ 2 1 0 1 0 1 1 0 1 0 1 1 0 3 ]
#1 : 14681 7 129 [ 5 4 3 2 3 2 3 2 3 0 1 0 1 1 ]
#2 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
#3 : 32639 1 129 [ 1 1 1 1 1 1 1 0 1 1 1 1 1 3 ]
#4 : 24576 1 8192 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 3 ]
#5 : 32639 1 129 [ 1 1 1 1 1 1 1 0 1 1 1 1 1 3 ]
#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 ]