mke2fs -F -O resize_inode -o Linux -b 1024 -g 1024 test.img 16384
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
4096 inodes, 16384 blocks
819 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=8421376
16 block groups
1024 blocks per group, 1024 fragments per group
256 inodes per group
Superblock backups stored on blocks: 
	1025, 3073, 5121, 7169, 9217

Allocating group tables:      done                            
Writing inode tables:      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
test_filesys: 11/4096 files (0.0% non-contiguous), 2107/16384 blocks
Exit status is 0
-----------------------------------------------
 
debugfs -R ''set_inode_field <7> block[2] 42'' -w test.img
Exit status is 0
Resize inode not valid.  Recreate? yes

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
Free blocks count wrong for group #0 (717, counted=718).
Fix? yes

Free blocks count wrong (14276, counted=14277).
Fix? yes


test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
test_filesys: 11/4096 files (0.0% non-contiguous), 2107/16384 blocks
Exit status is 1
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
test_filesys: 11/4096 files (0.0% non-contiguous), 2107/16384 blocks
Exit status is 0
-----------------------------------------------
 
debugfs -R ''clri <7>'' -w test.img
Exit status is 0
Resize inode not valid.  Recreate? yes

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
Free blocks count wrong for group #0 (717, counted=718).
Fix? yes

Free blocks count wrong (14276, counted=14277).
Fix? yes


test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
test_filesys: 11/4096 files (0.0% non-contiguous), 2107/16384 blocks
Exit status is 1
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
test_filesys: 11/4096 files (0.0% non-contiguous), 2107/16384 blocks
Exit status is 0
-----------------------------------------------
 
debugfs -R ''set_inode_field <7> bmap[524] 57'' -w test.img
Exit status is 0
Resize inode not valid.  Recreate? yes

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
Free blocks count wrong for group #0 (717, counted=718).
Fix? yes

Free blocks count wrong (14276, counted=14277).
Fix? yes


test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
test_filesys: 11/4096 files (0.0% non-contiguous), 2107/16384 blocks
Exit status is 1
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
test_filesys: 11/4096 files (0.0% non-contiguous), 2107/16384 blocks
Exit status is 0
-----------------------------------------------
 
debugfs -R ''set_super_value reserved_gdt_blocks 15679'' -w test.img
Exit status is 0
ext2fs_check_desc: Corrupt group descriptor: bad block for block bitmap
../e2fsck/e2fsck: Group descriptors look bad... trying backup blocks...
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

test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
test_filesys: 11/4096 files (0.0% non-contiguous), 2107/16384 blocks
Exit status is 1
-----------------------------------------------
 
debugfs -R ''set_super_value reserved_gdt_blocks 32'' -w test.img
Exit status is 0
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
Block bitmap differences:  -(35--258) -(1059--1282) -(3107--3330) -(5155--5378) -(7203--7426) -(9251--9474)
Fix? yes

Free blocks count wrong for group #0 (718, counted=942).
Fix? yes

Free blocks count wrong for group #1 (732, counted=956).
Fix? yes

Free blocks count wrong for group #3 (732, counted=956).
Fix? yes

Free blocks count wrong for group #5 (732, counted=956).
Fix? yes

Free blocks count wrong for group #7 (732, counted=956).
Fix? yes

Free blocks count wrong for group #9 (732, counted=956).
Fix? yes

Free blocks count wrong (14277, counted=15621).
Fix? yes


test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
test_filesys: 11/4096 files (0.0% non-contiguous), 763/16384 blocks
Exit status is 1
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
test_filesys: 11/4096 files (0.0% non-contiguous), 763/16384 blocks
Exit status is 0