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: 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: Sat Feb 2 06:09:05 2019 Last mount time: Wed May 22 06:12:25 2019 Last write time: Wed May 22 06:12:24 2019 Mount count: 38 Maximum mount count: -1 Last checked: Sat Feb 2 06:09:05 2019 Check interval: 0 (<none>) Lifetime writes: 64 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: 6423611 Default directory hash: half_md4 Directory Hash Seed: f58d6935-8fd6-4715-8d03-ba65d2abed3c Journal backup: inode blocks Checksum type: crc32c Checksum: 0x8f63e777 Journal features: journal_incompat_revoke journal_64bit journal_checksum_v3 Journal size: 512M Journal length: 131072 Journal sequence: 0x000ed80f Journal start: 73149 Journal checksum type: crc32c Journal checksum: 0x88ea8aed
debugfs
