df -H→tune2fs -l /dev/mapper/data-rootでFilesystem features、Default mount optionsの拡張属性を確認

MacBook Late2009にインストールしたelementary osにて

root@MacBook-0ee18cdc:/# df -H
Filesystem             Size  Used Avail Use% Mounted on
udev                   4.0G     0  4.0G   0% /dev
tmpfs                  808M  3.5M  804M   1% /run
/dev/mapper/data-root  980G   25G  905G   3% /
tmpfs                  4.1G  4.1k  4.1G   1% /dev/shm
tmpfs                  5.3M  8.2k  5.3M   1% /run/lock
tmpfs                  4.1G     0  4.1G   0% /sys/fs/cgroup
/dev/sda1              276M   12M  264M   5% /boot/efi
tmpfs                  808M  7.5M  800M   1% /run/user/1000
root@MacBook-0ee18cdc:/# tune2fs -l /dev/mapper/data-root
tune2fs 1.45.5 (07-Jan-2020)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          978aeea4-0a2c-4727-9736-b9dd584d23a7
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:              60784640
Block count:              243121152
Reserved block count:     12156057
Free blocks:              233063982
Free inodes:              60552478
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:       Sun Aug 15 18:27:41 2021
Last mount time:          Thu Dec 23 19:07:36 2021
Last write time:          Thu Dec 23 19:07:34 2021
Mount count:              22
Maximum mount count:      -1
Last checked:             Sun Aug 15 18:27:41 2021
Check interval:           0 (<none>)
Lifetime writes:          53 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:       40897027
Default directory hash:   half_md4
Directory Hash Seed:      c5917fea-e1e3-45e7-a5c9-6fed2eb16e32
Journal backup:           inode blocks
Checksum type:            crc32c
Checksum:                 0xf776172b

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