--- /tmp/1      2012-10-07 14:51:39.337345910 +0000
+++ -   2012-10-07 14:51:52.454825889 +0000
@@ -3,7 +3,7 @@
 Filesystem UUID:          72aa9b1c-4180-444a-8e15-836ddad4f235
 Filesystem magic number:  0xEF53
 Filesystem revision #:    1 (dynamic)
-Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
+Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
 Filesystem flags:         signed_directory_hash 
 Default mount options:    user_xattr acl
 Filesystem state:         clean
@@ -24,9 +24,9 @@
 Inode blocks per group:   384
 Flex block group size:    16
 Filesystem created:       Mon May 28 04:06:58 2012
-Last mount time:          Sun Oct  7 14:51:04 2012
-Last write time:          Sun Oct  7 14:51:33 2012
-Mount count:              6
+Last mount time:          Sun Oct  7 14:51:42 2012
+Last write time:          Sun Oct  7 14:51:42 2012
+Mount count:              7
 Maximum mount count:      -1
 Last checked:             Tue Oct  2 22:53:14 2012
 Check interval:           0 (<none>)
@@ -42,7 +42,7 @@
 Directory Hash Seed:      f5fe1926-d2da-4864-b41f-a93276ae313f
 Journal backup:           inode blocks
 Checksum type:            crc32c
-Checksum:                 0x0063be5b
+Checksum:                 0x90bee798
 Journal features:         journal_incompat_revoke
 Journal size:             16M
 Journal length:           4096
# ln /boot/sid.bmp /boot/foo  
# dumpe2fs -h /dev/md0 | diff -u /tmp/1 -
dumpe2fs 1.43-WIP (22-Sep-2012)
--- /tmp/1      2012-10-07 14:51:39.337345910 +0000
+++ -   2012-10-07 14:53:43.619910763 +0000
@@ -3,7 +3,7 @@
 Filesystem UUID:          72aa9b1c-4180-444a-8e15-836ddad4f235
 Filesystem magic number:  0xEF53
 Filesystem revision #:    1 (dynamic)
-Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
+Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
 Filesystem flags:         signed_directory_hash 
 Default mount options:    user_xattr acl
 Filesystem state:         clean
@@ -24,9 +24,9 @@
 Inode blocks per group:   384
 Flex block group size:    16
 Filesystem created:       Mon May 28 04:06:58 2012
-Last mount time:          Sun Oct  7 14:51:04 2012
-Last write time:          Sun Oct  7 14:51:33 2012
-Mount count:              6
+Last mount time:          Sun Oct  7 14:51:42 2012
+Last write time:          Sun Oct  7 14:51:42 2012
+Mount count:              7
 Maximum mount count:      -1
 Last checked:             Tue Oct  2 22:53:14 2012
 Check interval:           0 (<none>)
@@ -42,10 +42,10 @@
 Directory Hash Seed:      f5fe1926-d2da-4864-b41f-a93276ae313f
 Journal backup:           inode blocks
 Checksum type:            crc32c
-Checksum:                 0x0063be5b
+Checksum:                 0x90bee798
 Journal features:         journal_incompat_revoke
 Journal size:             16M
 Journal length:           4096
-Journal sequence:         0x0000f765
-Journal start:            0
+Journal sequence:         0x0000f766
+Journal start:            1