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 : 23641 22 558 [ 13 6 8 8 10 8 3 3 4 2 2 3 3 0 ]
#1 : 10172 13 556 [ 4 4 2 3 5 4 3 4 2 3 3 2 0 0 ]
#2 : 7215 29 500 [ 13 15 15 17 14 3 2 1 5 0 1 0 1 0 ]
#3 : 20649 34 554 [ 15 15 15 20 8 7 1 2 1 2 4 1 3 0 ]
#4 : 3284 11 494 [ 4 6 5 2 6 2 2 3 0 1 0 1 0 0 ]
#5 : 8993 29 552 [ 5 6 10 11 19 3 4 6 7 1 3 1 0 0 ]
#6 : 23789 9 494 [ 3 3 5 4 3 2 3 1 1 1 0 1 1 2 ]
#7 : 19928 1 552 [ 0 0 0 1 1 0 1 1 1 0 1 1 2 1 ]