How to mount freeBSD ufs ?

freeink · Mar 28, 2020

I want mount freeBSD /dev/sda6/ ufs from Linux.

sudo mount -t ufs -o ro,ufstype=sunx86 /dev/sda6 /mnt/solaris

give me errors :
mount: /mnt/solaris: wrong fs type, bad option, bad superblock on /dev/sda6, missing codepage or helper program, or other error.

device information as below (dual efi boot)
sudo fdisk /dev/sda -l

scottro · Mar 28, 2020

First you need the ufs module, which I assume you have (though I may be remembering incorrectly as to the error message)
Then I believe it's ufstype=ufs2, (Unless this is a Solaris partition )
https://www.cyberciti.biz/faq/howto-linux-mount-freebsd-ufs2-filesystem/

As T-Daemon pointed out, I had a typo, which I've fixed.

T-Daemon · Mar 28, 2020

scottro said:
ufstype=usfs2

You have a typo there.

freeink said:
I want mount freeBSD /dev/sda6/ ufs from Linux.

Make sure the ufs module is loaded, run
lsmod | grep ufs
if it doesn't appear, run
sudo modprobe ufs, then
sudo mount -t ufs -o ro,ufstype=ufs2 /dev/sda6 /mnt/solaris

ShelLuser · Mar 28, 2020

Still... why ask Linux questions in a FreeBSD forum? This is probably best redirected to the forum for whatever distribution you're using, because there tends to be quite some difference between those.

zirias@ · Mar 28, 2020

OTOH, I wouldn't expect too much knowledge concerning UFS on your typical Linux forum...

But it's definitely in the wrong category here

Zvoni · Mar 28, 2020

What i don't understand: why does he want to mount the whole partition? As in: mounting the Root-Folder of his FreeBSD-System.
And if it's a Multi-boot-Environment, why does he has 2 EFI-Partitions?

Phishfry · Mar 28, 2020

Zvoni said:
And if it's a Multi-boot-Environment, why does he has 2 EFI-Partitions?

This is actually a valid way to use multi boot operating systems.
You see we have bootx64.efi in the EFI partition. Problem is some other operating systems use the exact same file name.
So a valid work-around is to have separate EFI partitions for multi-boot.
See example here:

Laptops/Lenovo_Yoga_3_14/DualBoot - FreeBSD Wiki

ralphbsz · Mar 28, 2020

Zvoni said:
What i don't understand: why does he want to mount the whole partition? As in: mounting the Root-Folder of his FreeBSD-System.
And if it's a Multi-boot-Environment, why does he has 2 EFI-Partitions?

Probably because you can't mount something smaller than a whole partition. Certainly, the root directories (like /etc and /bin and /usr/lib) will be pretty useless on Linux, but they don't hurt, other than perhaps causing confusion.