dumpe2fs /dev/loop0
dumpe2fs 1.41.12 (17-May-2010)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          738c69d5-8be7-4cca-aadb-b896209a0c99
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype sparse_super large_file
Filesystem flags:         signed_directory_hash
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              1191360
Block count:              4765272
Reserved block count:     238263
Free blocks:              3847880
Free inodes:              1058507
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1022
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8160
Inode blocks per group:   510
Filesystem created:       Wed Oct 12 09:51:09 2011
Last mount time:          Wed Oct 12 10:07:37 2011
Last write time:          Wed Oct 12 10:07:24 2011
Mount count:              2
Maximum mount count:      35
Last checked:             Wed Oct 12 09:51:09 2011
Check interval:           15552000 (6 months)
Next check after:         Mon Apr  9 09:51:09 2012
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      9fa0e682-88a9-4f33-954c-420d4d554058
Journal backup:           inode blocks
Journal superblock magic number invalid!