dumpe2fs: MMP: invalid magic number while trying to open test.img
Exit status is 2
Superblock has invalid MMP magic.  Fix? yes

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
test_filesys: 11/128 files (0.0% non-contiguous), 19/512 blocks
Exit status is 0
dumpe2fs: it is safe to mount 'test.img', MMP is clean
Exit status is 0
MMP_block:
    mmp_magic: 0x4d4d50
    mmp_check_interval: 5
    mmp_sequence: 0xff4d4d50
    mmp_update_date: test date
    mmp_update_time: test_time
    mmp_node_name: test_node
    mmp_device_name: test.img
    mmp_block_number: 8