File: //proc/fs/ext4/md1/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 : 5924 28 4713 [ 16 18 12 16 10 11 5 8 5 3 1 0 0 0 ]
#1 : 18910 27 632 [ 8 9 5 6 12 8 11 10 4 4 5 0 0 1 ]
#2 : 31407 45 516 [ 23 24 22 24 57 4 5 2 5 1 1 1 2 2 ]
#3 : 2604 22 578 [ 4 4 4 2 8 4 2 5 4 1 0 0 0 0 ]
#4 : 3109 18 513 [ 13 6 7 6 10 1 2 1 4 1 1 0 0 0 ]
#5 : 17775 2 578 [ 1 1 1 1 2 2 0 2 2 1 2 1 1 1 ]
#6 : 28831 27 516 [ 5 9 6 2 12 5 4 0 2 2 0 3 1 2 ]
#7 : 4949 14 578 [ 1 2 2 1 4 4 2 6 5 1 2 0 0 0 ]