如何挂载备份ext4超级块？我在执行指令时出错了

Question

在不小心格式化了ext4分区之后，我正在尝试恢复内容。我正在从Live运行系统，并跟随本指南挂载备份超级块。但是，当我试图挂载它时，我会得到一个错误。我得到的是：

ubuntu@ubuntu:/$ sudo dumpe2fs /dev/nvme0n1p4 | grep -i superblock
dumpe2fs 1.45.3 (14-Jul-2019)
  Primary superblock at 0, Group descriptors at 1-31
  Backup superblock at 32768, Group descriptors at 32769-32799
  Backup superblock at 98304, Group descriptors at 98305-98335
  Backup superblock at 163840, Group descriptors at 163841-163871
  Backup superblock at 229376, Group descriptors at 229377-229407
  Backup superblock at 294912, Group descriptors at 294913-294943
  Backup superblock at 819200, Group descriptors at 819201-819231
  Backup superblock at 884736, Group descriptors at 884737-884767
  Backup superblock at 1605632, Group descriptors at 1605633-1605663
  Backup superblock at 2654208, Group descriptors at 2654209-2654239
  Backup superblock at 4096000, Group descriptors at 4096001-4096031
  Backup superblock at 7962624, Group descriptors at 7962625-7962655
  Backup superblock at 11239424, Group descriptors at 11239425-11239455
  Backup superblock at 20480000, Group descriptors at 20480001-20480031
  Backup superblock at 23887872, Group descriptors at 23887873-23887903
ubuntu@ubuntu:/$ sudo mount -o sb=32768 /dev/nvme0n1p4 /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/nvme0n1p4, missing codepage or helper program, or other error.
ubuntu@ubuntu:/$ sudo mount -o sb=98304 /dev/nvme0n1p4 /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/nvme0n1p4, missing codepage or helper program, or other error.
ubuntu@ubuntu:/$ sudo mount -o sb=23887872 /dev/nvme0n1p4 /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/nvme0n1p4, missing codepage or helper program, or other error.

我在这里做错什么了？

Answer 1

要做的第一件事是将块设备的"dd“复制到另一个设备，如果可能的话。

然后，在设备上运行e2fsck，看看它是否能够恢复文件系统。它将自动检查备份超级块的位置正常。