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 : 12213 23 558 [ 11 15 9 7 7 8 3 6 4 1 1 0 2 0 ]
#1 : 13612 21 563 [ 14 13 9 10 9 8 6 3 6 3 1 4 0 0 ]
#2 : 13088 19 1024 [ 12 10 8 8 8 3 3 2 4 2 0 3 1 0 ]
#3 : 31976 5 552 [ 0 0 0 1 2 4 3 3 4 3 4 2 3 1 ]
#4 : 3302 11 492 [ 2 2 8 2 7 2 2 3 0 1 0 1 0 0 ]
#5 : 26099 7 552 [ 1 1 0 2 2 2 0 1 1 0 1 0 0 3 ]
#6 : 24751 22 490 [ 1 7 6 5 12 7 3 8 4 5 3 2 3 0 ]
#7 : 10191 15 552 [ 3 2 2 2 5 7 4 7 2 2 3 2 0 0 ]