how to mount NetBSD ffs partition under live linux

Jay

First import ufs module from terminal :

sudo modprobe ufs

Then find your NetBSD partition using :

sfdisk -l

And mount NetBSD partition with :

mkdir /mnt/netbsd
mount -t ufs -o ro,ufstype=44bsd /dev/sda1 /mnt/netbsd/

JuvenalUrbino

Jay

Jay First import ufs module from terminal :
sudo modprobe ufs

or, if mounting UFS is planned on fron the begin, one can configire a kernel with built-in support by specifying in the kernel config:

CONFIG_UFS_FS=y
CONFIG_UFS_FS_WRITE=y

And mount NetBSD partition with :
mkdir /mnt/netbsd
mount -t ufs -o ro,ufstype=44bsd /dev/sda1 /mnt/netbsd/

also, in order to mount a FFSv2 (UFS2) partition:

sudo mount -t ufs -o ufstype=ufs2 /dev/sda1 /mnt/netbsd

Side Note: Illumos UFS support is codified by ufstype=sun

marietto

it didn't work for me.

root@Z390-AORUS-PRO:/home/ziomario# sudo modprobe ufs
ok

Disk /dev/sda: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: CT500MX500SSD4  
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x00000000

Dispositivo Avvio  Start      Fine   Settori   Size Id Tipo

/dev/sda1           2048    264191    262144   128M ef EFI (FAT-12/16/32)
/dev/sda2   *     266240 976773167 976506928 465.6G a9 NetBSD

root@Z390-AORUS-PRO:/home/ziomario# mkdir /mnt/netbsd 

root@Z390-AORUS-PRO:/home/ziomario# mount -t ufs -o ro,ufstype=44bsd /dev/sda2 /mnt/netbsd

mount: /mnt/netbsd: wrong fs type, bad option, bad superblock on /dev/sda2, missing codepage or helper program, or other error.

rvp

marietto it didn't work for me.

See JU's post right above yours. (ufstype=ufs2)

marietto

ok. ufs2 works. any chance to mount it in rw ?

rvp

marietto any chance to mount it in rw ?

Non-native RW-mounting is always risky. I keep an ext2 filesystem around for data xfers between OSes.

bsduck

Depends on the distribution. OpenSUSE allows it. Most others don't, you have to build a custom kernel.

marietto

at this point I will use freebsd... any chance to change fstype=44bsd with fstype=ufs2 ? :D

bsduck

marietto any chance to change fstype=44bsd with fstype=ufs2 ?

I'm not sure to understand the question. FreeBSD supports both UFS2 (default) and UFS1, if that's it.

marietto

I mean that using 44bsd does not work (at least under ubuntu),but what it works is ufstype=ufs2. So,do u want to fix your "error",changing 44bsd with ufs2 ? give a look at the post below...

https://www.reddit.com/r/NetBSD/comments/qqcf0a/im_trying_to_mount_the_netbsd_partition_under/

JuvenalUrbino

marietto the post from @Jay is meant to show how to mount a BSD UFS (FFSv1) partition on Linux, and, limited to that l, it is correct. In other words, the solution suggested is consistent with the premises and fully satisfies them.
I expanded on Jay's post by showing how to mount a UFS2 (FFSv2) partition, which nowadays is much more common to come across to due to it being the default filesystem on more than a BSD projecr. This however doesn't necessarily apply to OpenBSD where FFSv2 was imported more recently, nor to older systems.

marietto

I have one installation of Open Indiana on the disk sdb and i tried to mount it with the command suggested by you and it didn't work.


root@Z390-AORUS-PRO:/home/ziomario# fdisk /dev/sdb -l

Disk /dev/sdb: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: Samsung SSD 860 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0544649f

Dispositivo Avvio Start      Fine   Settori   Size Id Tipo
/dev/sdb1   *     25088 976751103 976726016 465.7G bf Solaris

root@Z390-AORUS-PRO:/home/ziomario# sudo mount -t ufs -o ufstype=sun /dev/sdb1 /mnt/sdb1
mount: /mnt/sdb1: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program, or other error.

root@Z390-AORUS-PRO:/home/ziomario# mount -t ufs -o ufstype=sun /dev/sdb1 /mnt/sdb
mount: /mnt/sdb: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program, or other error.

JuvenalUrbino

marietto OpenIndiana defaults to ZFS, the installer doesn't even give the option to install on UFS (as opposed to Solaris 10, or Tribblix which includes a script to set up a Sun UFS disk).
You're most likely trying to mount a ZFS partition as UFS and that's why the command is failing.

marietto

JuvenalUrbino

the post of Jay is not clear. I think that it's a good idea to specify at the beginning of the post,this sentence "how to mount a BSD UFS (FFSv1) partition on Linux". I see this sentence very good for the title,because the title that you have now makes confusion for all the people not so much experienced. Try to always start thinking that who is reading what you are writing knows a little or nothing what you already know and for this reason you should be more explicative as possible. In this case FFSv1 is better than FFS :)

marietto

JuvenalUrbino

thanks for the explanation. but can u write here the solution ? how to mount on linux the partition where are saved the open-indiana files. This will be more useful and even more explicative than explaining only the background of the story. very thanks.