특정 파일시스템의 수퍼블럭의 정보 및 상태 확인하기

 . 파일시스템(Filesystem) UUID
 . 파일시스템(Filesystem) magic number
 . 파일시스템(Filesystem) revision
 . 파일시스템(Filesystem) features
 . 파일시스템(Filesystem) state
 . Errors behavior
 . 파일시스템(Filesystem) OS type
 . Inode 개수(count)
 . Block 개수(count)
 . 사용 유보된 블럭 개수(Reserved block count)
 . 미사용 블럭수(Free blocks)
 . 미사용 inodes(Free inodes)
 . 블럭 크기(Block size)
 . 프레그먼트 크기(Fragment size)
 . 블럭그룹 당 블럭수(Blocks per group)
 . 블럭그룹 당 프레그먼트수(Fragments per group)
 . 블럭그룹 당 Inode수(Inodes per group)
 . 블럭그룹 당 Inode블럭수(Inode blocks per group)
 . 파일시스템(Filesystem) 생성날짜
 . 최종 마운트시간
 . 최종 저장시간
 . 마운트 횟수
 . 마지막 점검시간
 . 각블럭의 상세정보
     - Primary superblock
     - Group descriptors
     - Block bitmap
     - Inode bitmap
     - Inode table
     - free blocks
     - free inodes
     - directories

[root@su250 sulinux]# debugfs -w /dev/sda3

debugfs 1.41.3 (12-Oct-2008)

debugfs: 

debugfs:  stats

Filesystem volume name:   /home

Last mounted on:          <not available>

Filesystem UUID:          e258fd21-3bda-4c09-8e71-bb0519d6b2cc

Filesystem magic number:  0xEF53

Filesystem revision #:    1 (dynamic)

Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recov

ery sparse_super large_file

Filesystem flags:         signed_directory_hash

Default mount options:    user_xattr acl

Filesystem state:         clean

Errors behavior:          Continue

Filesystem OS type:       Linux

Inode count:              65808

Block count:              263064

Reserved block count:     13153

Free blocks:              249919

Free inodes:              65594

First block:              0

Block size:               4096

Fragment size:            4096

Reserved GDT blocks:      64

Blocks per group:         32768

Fragments per group:      32768

Inodes per group:         7312

Inode blocks per group:   457

Filesystem created:       Mon Dec  1 21:47:55 2008

Last mount time:          Sun Jan  4 19:43:38 2009

Last write time:          Sun Jan  4 22:13:48 2009

Mount count:              30

Maximum mount count:      -1

Last checked:             Mon Dec  1 21:47:55 2008

Check interval:           0 (<none>)

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:      d8d9df44-8e11-4cbc-a345-a394c6bec699

Journal backup:           inode blocks

Directories:              99

 Group  0: block bitmap at 66, inode bitmap at 67, inode table at 68

           24033 free blocks, 7301 free inodes, 2 used directories

 Group  1: block bitmap at 32834, inode bitmap at 32835, inode table at 32836

           32129 free blocks, 7295 free inodes, 6 used directories

 Group  2: block bitmap at 65536, inode bitmap at 65537, inode table at 65538

           32309 free blocks, 7312 free inodes, 0 used directories

 Group  3: block bitmap at 98370, inode bitmap at 98371, inode table at 98372

           32235 free blocks, 7304 free inodes, 5 used directories

 Group  4: block bitmap at 131072, inode bitmap at 131073, inode table at 131074

           32309 free blocks, 7312 free inodes, 0 used directories

 Group  5: block bitmap at 163906, inode bitmap at 163907, inode table at 163908

           32234 free blocks, 7303 free inodes, 5 used directories

Group  6: block bitmap at 196608, inode bitmap at 196609, inode table at 196610

           32309 free blocks, 7312 free inodes, 0 used directories

 Group  7: block bitmap at 229442, inode bitmap at 229443, inode table at 229444

           31900 free blocks, 7143 free inodes, 81 used directories

 Group  8: block bitmap at 262144, inode bitmap at 262145, inode table at 262146

           461 free blocks, 7312 free inodes, 0 used directories

debugfs:

debugfs: