1tune2fs metadata_csum test
2Creating filesystem with 524288 1k blocks and 65536 inodes
3Superblock backups stored on blocks:
4	8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409
5
6Allocating group tables:      done
7Writing inode tables:      done
8Creating journal (16384 blocks): done
9Creating 477 huge file(s) with 1024 blocks each: done
10Writing superblocks and filesystem accounting information:      done
11
12Pass 1: Checking inodes, blocks, and sizes
13Pass 2: Checking directory structure
14Pass 3: Checking directory connectivity
15Pass 4: Checking reference counts
16Pass 5: Checking group summary information
17
18Exit status is 0
19tune2fs -O metadata_csum test.img
20
21This operation requires a freshly checked filesystem.
22
23Please run e2fsck -fD on the filesystem.
24
25Exit status is 0
26test_filesys was not cleanly unmounted, check forced.
27Pass 1: Checking inodes, blocks, and sizes
28Pass 2: Checking directory structure
29Pass 3: Checking directory connectivity
30Pass 3A: Optimizing directories
31Pass 4: Checking reference counts
32Pass 5: Checking group summary information
33
34
35
36Change in FS metadata:
37@@ -2,7 +2,7 @@
38 Last mounted on:          <not available>
39 Filesystem magic number:  0xEF53
40 Filesystem revision #:    1 (dynamic)
41-Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize
42+Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
43 Default mount options:    user_xattr acl
44 Filesystem state:         clean
45 Errors behavior:          Continue
46@@ -10,7 +10,7 @@
47 Inode count:              65536
48 Block count:              524288
49 Reserved block count:     26214
50-Free blocks:              571
51+Free blocks:              568
52 Free inodes:              65048
53 First block:              1
54 Block size:               1024
55@@ -33,6 +33,7 @@
56 Journal inode:            8
57 Default directory hash:   half_md4
58 Journal backup:           inode blocks
59+Checksum type:            crc32c
60 Journal features:         (none)
61 Journal size:             16M
62 Journal length:           16384
63@@ -40,24 +41,24 @@
64 Journal start:            0
65
66
67-Group 0: (Blocks 1-8192)
68+Group 0: (Blocks 1-8192) [ITABLE_ZEROED]
69   Primary superblock at 1, Group descriptors at 2-5
70   Reserved GDT blocks at 6-261
71   Block bitmap at 262 (+261)
72   Inode bitmap at 278 (+277)
73   Inode table at 294-549 (+293)
74-  21 free blocks, 536 free inodes, 2 directories
75-  Free blocks: 4413-4433
76+  18 free blocks, 536 free inodes, 2 directories, 536 unused inodes
77+  Free blocks: 4413, 4417-4433
78   Free inodes: 489-1024
79-Group 1: (Blocks 8193-16384)
80+Group 1: (Blocks 8193-16384) [INODE_UNINIT, ITABLE_ZEROED]
81   Backup superblock at 8193, Group descriptors at 8194-8197
82   Reserved GDT blocks at 8198-8453
83   Block bitmap at 263 (bg #0 + 262)
84   Inode bitmap at 279 (bg #0 + 278)
85   Inode table at 550-805 (bg #0 + 549)
86-  0 free blocks, 1024 free inodes, 0 directories
87+  0 free blocks, 1024 free inodes, 0 directories, 1024 unused inodes
88   Free blocks:
89   Free inodes: 1025-2048
90-Group 2: (Blocks 16385-24576)
91+Group 2: (Blocks 16385-24576) [INODE_UNINIT, ITABLE_ZEROED]
92   Block bitmap at 264 (bg #0 + 263)
93   Inode bitmap at 280 (bg #0 + 279)
94Pass 1: Checking inodes, blocks, and sizes
95Pass 2: Checking directory structure
96Pass 3: Checking directory connectivity
97Pass 4: Checking reference counts
98Pass 5: Checking group summary information
99
100Exit status is 0
101