Re: [libvirt-users] [Libguestfs] Cannot guestmount a Fedora 24 XFS disk.
On Tue, Aug 09, 2016 at 05:15:34PM +0000, Andre Goree wrote:
The host is running Ubuntu 12.04 LTS and has the libguestfs package
installed -- which, if I'm not mistaken, provides libguestfs-xfs:
https://launchpad.net/ubuntu/+source/libguestfs
My bad, I didn't read the kernel message closely. If you look at:
> mount -o /dev/vda1 /sysroot/
> [ 1.759120] SGI XFS with ACLs, security attributes, realtime, large block/inode
numbers, no debug enabled
> [ 1.762869] XFS (vda1): Version 5 superblock detected. This kernel has
EXPERIMENTAL support enabled!
> [ 1.762869] Use of these features in this kernel is at your own risk!
> [ 1.764819] XFS (vda1): Superblock has unknown read-only compatible features
(0x1) enabled.
> [ 1.765834] XFS (vda1): Attempted to mount read-only compatible filesystem
read-write.
> [ 1.765834] Filesystem can only be safely mounted read only.
> [ 1.767472] XFS (vda1): SB validate failed with error 22.
> mount: wrong fs type, bad option, bad superblock on /dev/vda1,
> missing codepage or helper program, or other error
> In some cases useful info is found in syslog - try
> dmesg | tail or so
It's using your host kernel (which for Ubuntu 12.04 is ancient
history) to mount a recently created XFS filesystem (Fedora 24 is from
this year).
This isn't possible because of some new feature or other, and so you
can only mount it in read-only mode.
Hopefully using 'guestmount --ro' will work. You can check using the
'guestmount -v' and/or '-x' option that the "ro" option is
passed by
mount to the kernel.
If not then it'll be accessible via guestfish using the "mount-ro"
command.
Of course this is for reading only. It's not possible to write unless
you can upgrade your host kernel to something very much newer.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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