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) 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 Writing inode tables: 0/16 1/16 2/16 3/16 4/16 5/16 6/16 7/16 8/16 9/1610/1611/1612/1613/1614/1615/16done 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 Corruption found in superblock. (reserved_gdt_blocks = 15679). The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 1025 Exit status is 8 ----------------------------------------------- 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