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 6368 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 test.img
Setting inode size 256
Exit status is 0
Change in FS metadata:
@@ -13 +13 @@
-Free blocks:              12301
+Free blocks:              12
@@ -22 +22 @@
-Inode blocks per group:   128
+Inode blocks per group:   256
@@ -28 +28 @@
-Inode size:	          128
+Inode size:	          256
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