- Apply the patch to the doc root
- Build the handbook by running make
- Check the resulting filesystems.html
Yes, we do fully support ext4 read and write in FreeBSD 12+. We also support Extended Attributes, ACLs, and most features with the exception of journalling and encryption. As mentioned in BSDNow, 12.1 will have a DTrace provider.
Previous FreeBSD versions can access ext4 in read/write mode through the sysutils/fusefs-ext2 port.
I am not sure about "filesystem has full read and write support for ext4" because there some ext4 features, that uses rarely and we does not support it.
But may be do not dig into the details in this place.