dumpe2fs -f /dev/sda2
dumpe2fs 1.42.13 (17-May-2015)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          7a0d8d20-0698-4498-bff9-2ffc80f62f75
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash
Default mount options:    journal_data_writeback user_xattr acl
Filesystem state:         clean