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
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:
@@ -10,7 +10,7 @@
 Inode count:              65536
 Block count:              524288
 Reserved block count:     26214
-Free blocks:              570
+Free blocks:              567
 Free inodes:              65047
 First block:              1
 Block size:               1024
@@ -47,8 +47,8 @@
   Block bitmap at 262 (+261)
   Inode bitmap at 278 (+277)
   Inode table at 294-549 (+293)
-  21 free blocks, 535 free inodes, 3 directories, 535 unused inodes
-  Free blocks: 4414-4434
+  18 free blocks, 535 free inodes, 3 directories, 535 unused inodes
+  Free blocks: 4417-4434
   Free inodes: 490-1024
 Group 1: (Blocks 8193-16384) [INODE_UNINIT]
   Backup superblock at 8193, Group descriptors at 8194-8197
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