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  • linux fix the superblock by dumpe2fs fsck

    It seems that you have a bad superblock. To fix this:

    Firstly, boot into a live CD or USB

    Find out your partition number by using

    sudo fdisk -l|grep Linux|grep -Ev 'swap'
    

    Then, list all superblocks by using the command:

    sudo dumpe2fs /dev/sda2 | grep superblock
    

    Replace sda2 to your drive number

    You should get a similar output like this

      Primary superblock at 0, Group descriptors at 1-6
      Backup superblock at 32768, Group descriptors at 32769-32774
      Backup superblock at 98304, Group descriptors at 98305-98310
      Backup superblock at 163840, Group descriptors at 163841-163846
      Backup superblock at 229376, Group descriptors at 229377-229382
      Backup superblock at 294912, Group descriptors at 294913-294918
      Backup superblock at 819200, Group descriptors at 819201-819206
      Backup superblock at 884736, Group descriptors at 884737-884742
      Backup superblock at 1605632, Group descriptors at 1605633-1605638
      Backup superblock at 2654208, Group descriptors at 2654209-2654214
      Backup superblock at 4096000, Group descriptors at 4096001-4096006
      Backup superblock at 7962624, Group descriptors at 7962625-7962630
      Backup superblock at 11239424, Group descriptors at 11239425-11239430
      Backup superblock at 20480000, Group descriptors at 20480001-20480006
      Backup superblock at 23887872, Group descriptors at 23887873-23887878
    

    Choose an alternate superblock from this list, for this case alternate superblock # 32768

    Now, to check and repair a Linux file system using alternate superblock # 32768:

    sudo fsck -b 32768 /dev/sda2 -y
    

    The -y flag is used to skip all the Fix? questions and to answer them all with a yes automatically

    You should get similar output like this:

    fsck 1.40.2 (12-Jul-2007)
    e2fsck 1.40.2 (12-Jul-2007)
    /dev/sda2 was not cleanly unmounted, check forced.
    Pass 1: Checking inodes, blocks, and sizes
    Pass 2: Checking directory structure
    Pass 3: Checking directory connectivity
    Pass 4: Checking reference counts
    Pass 5: Checking group summary information
    Free blocks count wrong for group #241 (32254, counted=32253).
    Fix? yes
    Free blocks count wrong for group #362 (32254, counted=32248).
    Fix? yes
    Free blocks count wrong for group #368 (32254, counted=27774).
    Fix? yes
    ..........
    /dev/sda2: ***** FILE SYSTEM WAS MODIFIED *****
    /dev/sda2: 59586/30539776 files (0.6% non-contiguous), 3604682/61059048 blocks
    

    Now try mounting the partition

    sudo mount /dev/sda2 /mnt
    

    Now, try to browse the filesystem with the following commands

    cd /mnt
    mkdir test
    ls -l
    cp file /path/to/safe/location
    

    If you are able to perform the above commands, you have most probably fixed your error.

    Now, restart you computer and you should be able to boot normally.

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  • 原文地址:https://www.cnblogs.com/SZLLQ2000/p/9031285.html
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