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      1 tune2fs metadata_csum test
      2 Creating filesystem with 524288 1k blocks and 65536 inodes
      3 Superblock backups stored on blocks: 
      4 	8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409
      5 
      6 Allocating group tables:      done                            
      7 Writing inode tables:      done                            
      8 Creating journal (16384 blocks): done
      9 mke2fs: Operation not supported for inodes containing extents while creating huge files
     10 Writing superblocks and filesystem accounting information:      done
     11 
     12 Pass 1: Checking inodes, blocks, and sizes
     13 Pass 2: Checking directory structure
     14 Pass 3: Checking directory connectivity
     15 Pass 4: Checking reference counts
     16 Pass 5: Checking group summary information
     17 
     18 Exit status is 0
     19 tune2fs -O metadata_csum test.img
     20 Extents are not enabled.  The file extent tree can be checksummed, whereas block maps cannot.  Not enabling extents reduces the coverage of metadata checksumming.  Re-run with -O extent to rectify.
     21 64-bit filesystem support is not enabled.  The larger fields afforded by this feature enable full-strength checksumming.  Run resize2fs -b to rectify.
     22 Exit status is 0
     23 
     24 Change in FS metadata:
     25 @@ -2,7 +2,7 @@
     26  Last mounted on:          <not available>
     27  Filesystem magic number:  0xEF53
     28  Filesystem revision #:    1 (dynamic)
     29 -Filesystem features:      has_journal ext_attr resize_inode dir_index filetype sparse_super large_file
     30 +Filesystem features:      has_journal ext_attr resize_inode dir_index filetype sparse_super large_file metadata_csum
     31  Default mount options:    user_xattr acl
     32  Filesystem state:         clean
     33  Errors behavior:          Continue
     34 @@ -29,6 +29,7 @@
     35  Journal inode:            8
     36  Default directory hash:   half_md4
     37  Journal backup:           inode blocks
     38 +Checksum type:            crc32c
     39  Journal features:         (none)
     40  Journal size:             16M
     41  Journal length:           16384
     42 @@ -36,7 +37,7 @@
     43  Journal start:            0
     44  
     45  
     46 -Group 0: (Blocks 1-8192)
     47 +Group 0: (Blocks 1-8192) [ITABLE_ZEROED]
     48    Primary superblock at 1, Group descriptors at 2-3
     49    Reserved GDT blocks at 4-259
     50    Block bitmap at 260 (+259)
     51 @@ -45,7 +46,7 @@
     52    0 free blocks, 1013 free inodes, 2 directories
     53    Free blocks: 
     54    Free inodes: 12-1024
     55 -Group 1: (Blocks 8193-16384)
     56 +Group 1: (Blocks 8193-16384) [ITABLE_ZEROED]
     57    Backup superblock at 8193, Group descriptors at 8194-8195
     58    Reserved GDT blocks at 8196-8451
     59    Block bitmap at 8452 (+259)
     60 @@ -54,6 +55,6 @@
     61    0 free blocks, 1024 free inodes, 0 directories
     62    Free blocks: 
     63    Free inodes: 1025-2048
     64 -Group 2: (Blocks 16385-24576)
     65 +Group 2: (Blocks 16385-24576) [ITABLE_ZEROED]
     66    Block bitmap at 16385 (+0)
     67    Inode bitmap at 16386 (+1)
     68 Pass 1: Checking inodes, blocks, and sizes
     69 Pass 2: Checking directory structure
     70 Pass 3: Checking directory connectivity
     71 Pass 4: Checking reference counts
     72 Pass 5: Checking group summary information
     73 
     74 Exit status is 0
     75