ext4 couldn't be mounted.

I have formatted my hdd with built in mkfs.ext4 command over ssh, however afterwards router wasn’t able to mount the hdd, following is log error:

kern.err kernel: EXT4-fs (sda1): couldn't mount RDWR because of unsupported optional features (400)

Workaround solution for me was to reformat with extra options:

mkfs.ext4 -O^metadata_csum,^64bit -b 4096 -m0 -L MYHDD /dev/sda1

I suppose some kernel driver needs to be updated or kernel itself.

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