tune2fs ^metadata_csum test
Creating filesystem with 524288 1k blocks and 65536 inodes
Superblock backups stored on blocks: 
	8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409

Allocating group tables:      done                            
Writing inode tables:      done                            
Creating journal (16384 blocks): done
Creating 477 huge file(s) with 1024 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 -O ^metadata_csum,^uninit_bg test.img
Exit status is 0
Change in FS metadata:
@@ -2,7 +2,7 @@
 Last mounted on:          <not available>
 Filesystem magic number:  0xEF53
 Filesystem revision #:    1 (dynamic)
-Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
+Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize
 Default mount options:    user_xattr acl
 Filesystem state:         clean
 Errors behavior:          Continue
@@ -33,7 +33,6 @@
 Journal inode:            8
 Default directory hash:   half_md4
 Journal backup:           inode blocks
-Checksum type:            crc32c
 Journal features:         (none)
 Journal size:             16M
 Journal length:           16384
@@ -47,18 +46,18 @@
   Block bitmap at 262 (+261)
   Inode bitmap at 278 (+277)
   Inode table at 294-549 (+293)
-  21 free blocks, 536 free inodes, 2 directories, 536 unused inodes
+  21 free blocks, 536 free inodes, 2 directories
   Free blocks: 4413-4433
   Free inodes: 489-1024
-Group 1: (Blocks 8193-16384) [INODE_UNINIT]
+Group 1: (Blocks 8193-16384)
   Backup superblock at 8193, Group descriptors at 8194-8197
   Reserved GDT blocks at 8198-8453
   Block bitmap at 263 (bg #0 + 262)
   Inode bitmap at 279 (bg #0 + 278)
   Inode table at 550-805 (bg #0 + 549)
-  0 free blocks, 1024 free inodes, 0 directories, 1024 unused inodes
+  0 free blocks, 1024 free inodes, 0 directories
   Free blocks: 
   Free inodes: 1025-2048
-Group 2: (Blocks 16385-24576) [INODE_UNINIT]
+Group 2: (Blocks 16385-24576)
   Block bitmap at 264 (bg #0 + 263)
   Inode bitmap at 280 (bg #0 + 279)
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