File: //proc/thread-self/root/proc/self/root/proc/1475587/root/proc/fs/ext4/md1/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 : 7804 20 4706 [ 16 12 9 8 11 8 9 8 6 2 1 1 0 0 ]
#1 : 25074 25 600 [ 4 7 6 5 12 9 9 9 5 4 5 3 0 1 ]
#2 : 8368 53 516 [ 26 25 23 25 60 6 7 4 5 1 2 1 0 0 ]
#3 : 2528 12 578 [ 0 2 1 1 3 7 1 5 4 1 0 0 0 0 ]
#4 : 2638 9 513 [ 2 2 2 2 3 2 1 3 0 0 2 0 0 0 ]
#5 : 8710 19 578 [ 2 4 5 1 6 4 2 5 4 1 2 0 1 0 ]
#6 : 25439 23 516 [ 9 9 11 5 7 12 8 10 4 3 2 3 1 1 ]
#7 : 25400 25 578 [ 6 9 8 10 19 8 8 3 3 3 3 3 3 0 ]