Other How to mount NetBSD FFS filesystem under FreeBSD

[freezr]

Hello folks, I need to mount a NetBSD FFS disk but through XFCE4 I can mount it only in read mode.

I was convinced that Unix filesystems were compatible across all the BSD families.

I wonder if I can mount it with:

# mount -t ufs -o ro,ufstype=44bsd /dev/$PARTITION /mnt/netbsd

Hint found here: https://wiki.netbsd.org/tutorials/how_to_mount_ffs_partition_under_linux/#index4h1

Thanks... ?

 

[richardtoohey2]

I was convinced that Unix filesystems were compatible across all the BSD families.

I've never heard that, but never tried it either.

 

[Erichans]

I was convinced that Unix filesystems were compatible across all the BSD families.

That seems rather overly optimistic where it concerns read and write compatibility. AFAIK there was (is?) some trans-OS fs compatibility (with respect to FFS), but I'm not familiar with the details. For example, the presence in gpart(8):

netbsd-ccd      A NetBSD partition used with  Concatenated  Disk
                driver.      The     scheme-specific    type    is
                "!2db519c4-b10f-11dc-b99b-0019d1879648" for GPT.

netbsd-cgd      An encrypted NetBSD partition.  The  scheme-spe-
                cific type is
                "!2db519ec-b10f-11dc-b99b-0019d1879648" for GPT.

netbsd-ffs      A NetBSD partition that contains an UFS filesys-
                tem.     The     scheme-specific       type        is
                "!49f48d5a-b10e-11dc-b99b-0019d1879648" for GPT.

netbsd-lfs      A    NetBSD partition that contains an LFS filesys-
                tem.    The    scheme-specific        type    is
                "!49f48d82-b10e-11dc-b99b-0019d1879648" for GPT.

netbsd-raid     A    NetBSD partition used in a software RAID  con- 
                figuration.    The   scheme-specific   type   is
                "!49f48daa-b10e-11dc-b99b-0019d1879648" for GPT.

netbsd-swap     A    NetBSD partition dedicated to swap space.  The
                scheme-specific          type            is
                "!49f48d32-b10e-11dc-b99b-0019d1879648" for GPT.

and consequent absence in mount(8), is a clear hint that this is not supported.

A good option for this is to use ZFS; be aware of feature flags.