dumpe2fs
sudo dumpe2fs -h /dev/sda1
mop@ubuntu:~$ sudo dumpe2fs -h /dev/sda1
dumpe2fs 1.44.6 (5-Mar-2019)
Filesystem volume name: <none>
Last mounted on: /
Filesystem UUID: ca62659e-fc9f-4743-a4af-d26871e1430d
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: 7864320
Block count: 31456768
Reserved block count: 1572838
Free blocks: 28312221
Free inodes: 7645506
First block: