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 : 28517 1 4251 [ 1 0 1 0 0 1 1 0 1 1 1 1 0 3 ]
#1 : 25150 8 129 [ 4 3 5 2 1 2 1 1 1 0 0 0 0 3 ]
#2 : 20480 1 4096 [ 0 0 0 0 0 0 0 0 0 0 0 0 1 2 ]
#3 : 20951 15 129 [ 15 10 17 14 6 7 9 9 9 4 2 0 1 1 ]
#4 : 24100 1 8668 [ 0 0 1 0 0 1 0 0 0 1 1 1 1 2 ]
#5 : 31440 6 129 [ 4 4 3 1 3 4 2 3 4 2 0 0 1 3 ]
#6 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ]
#7 : 32127 1 129 [ 1 1 1 1 1 1 1 0 1 2 2 2 2 2 ]