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e2fsck external journal
../e2fsck/e2fsck: Filesystem has unsupported feature(s) while trying to open test.img
The superblock could not be read or does not describe a valid ext2/ext3/ext4
filesystem. If the device is valid and it really contains an ext2/ext3/ext4
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
or
e2fsck -b 32768 <device>
Exit status is 8
dumpe2fs external journal
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: journal_dev metadata_csum
Default mount options: user_xattr acl block_validity
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 0
Block count: 2048
Reserved block count: 0
Free blocks: 0
Free inodes: 0
First block: 1
Block size: 1024
Fragment size: 1024
Blocks per group: 8192
Fragments per group: 8192
Inodes per group: 0
Inode blocks per group: 0
Mount count: 0
Check interval: 0 (<none>)
Reserved blocks uid: 0
Reserved blocks gid: 0
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Default directory hash: half_md4
Checksum type: crc32c
Journal features: journal_64bit journal_checksum_v3
Total journal size: 2048k
Total journal blocks: 2048
Max transaction length: 2048
Fast commit length: 0
Journal first block: 3
Journal sequence: 0x00000003
Journal start: 0
Journal checksum type: crc32c
Journal checksum: 0x661e816f
Journal users: 117f752e-f27d-4f6f-a652-072586a29b82
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