Re: [Libguestfs] RHEL 7 and guestmount of XFS volumes

On Mon, Nov 25, 2019 at 12:08:33PM +0100, Fabien Dupont wrote: > Hi, > > I'm experiencing a weird behavior when tried to use guestmount with a XFS > formatted volume. I have created a RHEL 8 virtual machine using libvirt. I > have retrieved the disk image on a RHEL 7.7 server to mount the image root > filesystem and explore it. > > The command returns an error message: > > # guestmount -a /disks/jamesdream.qcow2 -m /dev/sda1 /mnt/ > libguestfs: error: mount_options: mount exited with status 32: mount: wrong > fs type, bad option, bad superblock on /dev/sda1, > missing codepage or helper program, or other error > > In some cases useful info is found in syslog - try > dmesg | tail or so. > guestmount: ‘/dev/sda1’ could not be mounted. > guestmount: Did you mean to mount one of these filesystems? > guestmount: /dev/sda1 (xfs) > guestmount: /dev/rhel/root (xfs) > guestmount: /dev/rhel/swap (swap) > > I have also run the same command with -x and -v options and the log is > attached. > > Seeing that it's not working on RHEL 7, I've tried the same command on > another RHEL 8.1 machine and it works. Looking at libguestfs-tools package > version, it appears that the package on RHEL 7.7 (1.40.2-5.el7_7.2) is more > recent than on RHEL 8.1 (1.38.4-14.module+el8.1.0+4066+0f1aadab). Is that > normal ? Hi Fabien, sadly yes this is normal, it's a kernel "bug" (disputed): https://bugzilla.redhat.com/show_bug.cgi?id=1667478 There's a somewhat hacky and definitely not supported workaround: https://access.redhat.com/solutions/3914591 Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW