File: //proc/fs/ext4/md2/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 : 14814 39 4688 [ 12 13 12 9 28 18 15 9 7 1 1 2 1 0 ]
#1 : 15804 53 579 [ 28 20 16 21 59 1 1 1 2 1 1 0 1 1 ]
#2 : 20048 9 513 [ 2 1 1 1 2 3 3 4 1 1 2 2 3 0 ]
#3 : 32190 1 578 [ 0 1 1 1 1 1 0 1 1 0 1 1 1 3 ]
#4 : 30145 12 517 [ 13 12 5 9 8 8 7 8 8 3 0 0 0 3 ]
#5 : 32190 1 578 [ 0 1 1 1 1 1 0 1 1 0 1 1 1 3 ]
#6 : 32255 1 513 [ 1 1 1 1 1 1 1 1 1 0 1 1 1 3 ]
#7 : 31678 1 578 [ 0 1 1 1 1 1 0 1 1 1 2 2 2 2 ]