Incorrect super block if I want to mount a FreeBSD-UFS2 disk

marietto

Hello.

Since it seems that my first GPU (intel CoffeeLake-S GT2 [UHD Graphics 630]) is not supported in NetBSD and after a very detailed troubleshooting,no one has been able to help me to fix the problem that I have,so I've installed DragonFlyBSD and yes,the same GPU is working great and I'm using it now. What I want to do is to play a little bit with qemu and nvmm. I want to understand how good they are together,comparing them with Qemu + KVM on Linux. And I want also try to pass thru my secondary GPU,nvidia RTX 2080 ti inside a Linux VM or even better,Windows 10 vm. Now. I have already configured in FreeBSD with bhyve all the VMs that I want to try on the DFLY. But all the img files are stored in a UFS2 dedicated USB disk. What I'm trying to do now is to mount the UFS2 partition where are stored the VMS on the DFLY 6.1 that I have installed on another disk,choosing Hammer2 as fs.

I would like to mount the FreeBSD GPT/UFS2 partitions that are located on my USB disks,for example on the disk /dev/da2 :

root@marietto:/home/marietto # gpt -v show /dev/da2

gpt show: /dev/da2: mediasize=320072933376; sectorsize=512; blocks=625142448
      start       size  index  contents
          0          1      -  PMBR
          1          1      -  Pri GPT header
          2         32      -  Pri GPT table
         34          6      -  Unused
         40     532480      0  GPT part - EFI System
     532520  616030208      1  GPT part - FreeBSD UFS/UFS2
  616562728    8388608      2  GPT part - FreeBSD Swap
  624951336     191079      -  Unused
  625142415         32      -  Sec GPT table
  625142447          1      -  Sec GPT header

I want mount the GPT part / FreeBSD UFS / UFS2 with index = 1,but unfortunately it says "incorrect super block"

root@marietto:/home/marietto # mount -t ufs /dev/da2s1 /mnt/da2s1
mount_ufs: /dev/da2s1 on /mnt/da2s1: incorrect super block

here u can see all the disk and partitions that I have on the system :

root@marietto:/home/marietto # ls /dev/da2*
/dev/da2    /dev/da2s0  /dev/da2s1  /dev/da2s2

marietto

@Jay : where is the mistake ?

Jay

marietto anything similar to "-t ufs -o ufstype=ufs2" ?

JuvenalUrbino

I think DragonFly never implemented UFS2 unfortunately

rvp

JuvenalUrbino Yeah. DragonFlyBSD only understands UFS1.
Create a filesystem using newfs -O1 -n ... on FreeBSD. Or, just create an ext2 filesystem. That's read-writable on all the BSDs.

marietto

Im not sure of it. I've reinstalled dragonfly on my external USB disk using the UFS partition scheme and I'm trying to mount this partition from FreeBSD. After a week of trouble shooting,we haven't been able to do that. You can follow the whole discussion here :

https://forums.freebsd.org/threads/how-to-reformat-a-formatted-ufs2-usb-disk-with-the-ufs1-file-system.83478/page-3

rvp

marietto I just reconfirmed this. DragonFlyBSD-6.0.1 mounts a UFS1 filesystem (a GPT partition) created using FreeBSD 13.0-RELEASE's newfs -O1 -n ... just fine...

marietto

ok,but you are not helping me to understand why we are frozen,why we aren't able to mount the ufs1 / dragonfly disk from freebsd.

rvp

marietto why we aren't able to mount the ufs1 / dragonfly disk from freebsd.

DragonFlyBSD seems to have a different disklabel location/scheme compared to the other BSDs. Once you get past that, you can mount DBSD's UFS1 just fine on FreeBSD.

I've hacked up some code to read DBSD disklabels. Send an email to me (same username) at SDF and I'll post it to you. It's a bit too large to put on the board here.