tune2fs test
Creating filesystem with 786432 1k blocks and 98304 inodes
Superblock backups stored on blocks: 
	8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409, 663553

Allocating group tables:      done                            
Writing inode tables:      done                            
Creating journal (16384 blocks): done
Creating 6334 huge file(s) with 117 blocks each: done
Writing superblocks and filesystem accounting information:      done

Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

Exit status is 0
tune2fs -I 256 -O metadata_csum test.img
Setting inode size 256

Please run e2fsck -fD on the filesystem.

Exit status is 0
Backing up journal inode block information.

Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 3A: Optimizing directories
Pass 4: Checking reference counts
Pass 5: Checking group summary information


Change in FS metadata:
@@ -5 +5 @@
-Filesystem features:      has_journal ext_attr dir_index filetype extent 64bit sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
+Filesystem features:      has_journal ext_attr dir_index filetype extent 64bit sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
@@ -21 +21 @@
-Inode blocks per group:   128
+Inode blocks per group:   256
@@ -27 +27 @@
-Inode size:	          128
+Inode size:	          256
@@ -30,0 +31 @@
+Checksum type:            crc32c
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

Exit status is 0