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 : 21856 19 558 [ 4 6 4 6 7 7 3 6 6 3 3 3 0 1 ]
#1 : 14087 21 555 [ 7 8 8 6 12 3 2 8 5 4 3 3 0 0 ]
#2 : 16830 19 490 [ 4 9 6 8 9 2 2 6 5 2 1 4 1 0 ]
#3 : 5968 21 552 [ 2 5 3 5 11 5 7 6 5 2 2 0 0 0 ]
#4 : 6691 4 492 [ 1 3 3 2 4 2 2 2 2 1 1 0 1 0 ]
#5 : 32216 1 552 [ 0 0 0 1 1 0 1 1 1 0 1 1 1 3 ]
#6 : 19344 50 508 [ 28 22 16 19 15 14 9 7 4 9 3 0 0 1 ]
#7 : 16405 13 552 [ 1 2 4 6 7 1 1 4 1 2 0 1 1 1 ]