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 : 28511 1 4257 [ 1 1 1 1 1 0 1 0 1 1 1 1 0 3 ]
#1 : 3573 26 180 [ 15 9 11 9 4 3 5 5 7 1 0 0 0 0 ]
#2 : 13852 14 6861 [ 10 13 6 6 3 2 1 2 4 2 1 3 1 0 ]
#3 : 11313 5 1231 [ 5 4 3 3 6 5 4 4 4 2 0 2 1 0 ]
#4 : 21916 3 8192 [ 2 1 2 2 2 1 1 0 1 0 1 2 2 1 ]
#5 : 15457 5 129 [ 5 4 3 3 3 4 2 4 3 3 0 0 3 0 ]
#6 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
#7 : 32639 1 129 [ 1 1 1 1 1 1 1 0 1 1 1 1 1 3 ]