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 : 8609 30 568 [ 7 5 14 11 18 7 8 4 5 1 1 0 1 0 ]
#1 : 3080 24 554 [ 8 10 9 9 14 7 5 3 5 1 0 0 0 0 ]
#2 : 11621 25 490 [ 3 13 10 12 12 2 3 4 5 0 1 0 0 1 ]
#3 : 29295 9 552 [ 1 3 2 2 7 5 3 3 3 2 6 2 2 1 ]
#4 : 1601 30 496 [ 15 13 8 1 5 5 6 1 3 0 0 0 0 0 ]
#5 : 15387 26 552 [ 13 15 12 2 1 3 3 3 3 5 1 3 1 0 ]
#6 : 32275 1 493 [ 1 1 0 0 1 0 0 0 0 1 1 1 1 3 ]
#7 : 19928 1 552 [ 0 0 0 1 1 0 1 1 1 0 1 1 2 1 ]