ogra@localhost:~$ sudo tune2fs -l /dev/mmcblk1p9
tune2fs 1.42.13 (17-May-2015)
Filesystem volume name:   writable
Last mounted on:          /tmpmnt_writable
Filesystem UUID:          6d69a7df-211b-4397-a305-f8a6f69a4002
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize
Filesystem flags:         signed_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              31061040
Block count:              124727788
Reserved block count:     6236197
Free blocks:              120446656
Free inodes:              31061001
First block:              1
Block size:               1024
Fragment size:            1024
Group descriptor size:    64
Blocks per group:         8192
Fragments per group:      8192
Inodes per group:         2040
Inode blocks per group:   255
RAID stride:              57242
Flex block group size:    16
Filesystem created:       Fri Sep 23 15:44:22 2016
Last mount time:          Fri Sep 23 16:25:31 2016
Last write time:          Fri Sep 23 16:25:31 2016
Mount count:              2
Maximum mount count:      -1
Last checked:             Fri Sep 23 15:45:28 2016
Check interval:           0 (<none>)
Lifetime writes:          4149 MB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:	          128
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      5d4e9ee6-1b56-48c2-ab70-f37f5748cf7e
Journal backup:           inode blocks