I have downloaded Debian GNU/Hurd disk image. However, while the virtual machine was running, my PC crash along with the virtual machine. I tried to start the virtual machine, but many things were not working because the filesystem was damaged. As far as I know, EXT4 is a journaling filesystem, so any damage to the filesystem should be recoverable if the filesystem is EXT4. Now I want to convert the root filesystem (from a backup copy of the disk image) from EXT2 to EXT4. I know that's possible, but I'm not sure whether Debian GNU/Hurd supports EXT4 formatted filesystems.
As far as I’m aware, there’s no translator for Ext4, whether in Debian specifically or in the Hurd in general. The existing
ext2fs translator doesn’t support Ext4, and the version packaged in Debian doesn’t either.