显示ext2，ext3和ext4文件系统信息

Linux Dumpe2fs命令

dumpe2fs命令用于显示有关ext2，ext3和ext4文件系统的信息。dumpe2fs显示设备上存在的文件系统的超级块和块组信息。

语法

dumpe2fs [-bfhixV] [-o superblock = superblock] [-o blocksize = blocksize]设备

显示超级块信息

john@john-desktop:~$ sudo dumpe2fs -h /dev/sda1
dumpe2fs 1.42 (29-Nov-2011)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          4daba06c-1d4d-4bbc-8f66-0a48cb20d0b4
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:              9609216
Block count:              38419456
Reserved block count:     1920972
Free blocks:              11195030
Free inodes:              8480522
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1014
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 Oct 22 19:36:56 2011
Last mount time:          Tue Jul 23 19:57:51 2013
Last write time:          Wed Jul 17 12:06:55 2013
Mount count:              6
Maximum mount count:      35
Last checked:             Wed Jul 17 12:06:55 2013
Check interval:           15552000 (6 months)
Next check after:         Mon Jan 13 11:06:55 2014
Lifetime writes:          605 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:       6553671
Default directory hash:   half_md4
Directory Hash Seed:      0206aa9d-9545-4e90-886e-d76a5511ebc7
Journal backup:           inode blocks
Journal features:         journal_incompat_revoke
Journal size:             128M
Journal length:           32768
Journal sequence:         0x00242dd8
Journal start:            23267