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 : 20537 26 558 [ 13 14 10 9 14 6 2 3 4 4 2 3 2 0 ]
#1 : 15806 6 557 [ 4 3 3 1 4 3 0 2 2 1 2 2 2 0 ]
#2 : 18934 12 496 [ 6 6 5 6 4 3 2 1 4 0 3 1 1 1 ]
#3 : 21655 14 552 [ 3 2 2 3 7 6 9 2 4 2 4 1 3 0 ]
#4 : 1386 25 501 [ 16 13 12 12 11 8 4 0 2 0 0 0 0 0 ]
#5 : 16266 28 554 [ 12 13 15 9 10 4 3 2 2 3 1 2 0 1 ]
#6 : 21664 16 493 [ 2 3 2 2 6 9 4 6 3 2 4 1 3 0 ]
#7 : 1432 21 552 [ 4 8 5 8 13 3 2 3 2 0 0 0 0 0 ]