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[root@flash jean]# tune2fs -l /dev/sda2
tune2fs 1.45.6 (20-Mar-2020)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          1d06123c-8152-44f7-8c7b-2c4480ba8442
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 metadata_csum
Filesystem flags:         signed_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              30466048
Block count:              121843457
Reserved block count:     6092172
Free blocks:              114360980
Free inodes:              30155825
First block:              0
Block size:               4096
Fragment size:            4096
Group descriptor size:    64
Reserved GDT blocks:      1024
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Fri May  1 14:28:45 2020
Last mount time:          Sat Jun 13 19:58:48 2020
Last write time:          Sat Jun 13 19:58:48 2020
Mount count:              255
Maximum mount count:      -1
Last checked:             Fri May  1 14:28:45 2020
Check interval:           0 (<none>)
Lifetime writes:          111 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     32
Desired extra isize:      32
Journal inode:            8
First orphan inode:       13631516
Default directory hash:   half_md4
Directory Hash Seed:      1facbdba-f2bf-4d4f-9e82-4918fd4d64b4
Journal backup:           inode blocks
Checksum type:            crc32c
Checksum:                 0x805edcc9