vadi@gooseberry:~$ tune2fs -l /dev/sda1
tune2fs 1.42 (29-Nov-2011)
tune2fs: Permission denied while trying to open /dev/sda1
Couldn't find valid filesystem superblock.
vadi@gooseberry:~$ sudo tune2fs -l /dev/sda1
tune2fs 1.42 (29-Nov-2011)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          20aa0109-67bb-46a0-95c6-626f0f0487eb
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              6807552
Block count:              27228928
Reserved block count:     1361446
Free blocks:              2430490
Free inodes:              6379403
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1017
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Sat Mar 24 04:28:52 2012
Last mount time:          Fri May 18 07:38:12 2012
Last write time:          Tue May  1 08:51:10 2012
Mount count:              9
Maximum mount count:      37
Last checked:             Tue May  1 08:51:10 2012
Check interval:           15552000 (6 months)
Next check after:         Sun Oct 28 08:51:10 2012
Lifetime writes:          353 GB
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
First orphan inode:       5821341
Default directory hash:   half_md4
Directory Hash Seed:      a2d423c6-0d65-4b96-b3c9-482c1ba073a5
Journal backup:           inode blocks
vadi@gooseberry:~$