• Fabio Massimo Di Nitto's avatar
    [GFS2] Check for installation of mount helpers for DLM mounts · 0b7580c7
    Fabio Massimo Di Nitto authored
    
    
    The patch is a fix to abort mount if the mount.gfs* and possible
    umount.* are missing from /sbin.
    
    While we do what we can to guarantee that they are installed properly in
    userland (CVS HEAD), we want to make sure that mount still aborts properly.
    
    The only sign of missing helpers is that lock_dlm will receive no mount options
    at all. According to David the problem does not exist for lock_nolock as the
    helpers are not required.
    
    The patch has been tested for both gfs and gfs2 and it works as expected. The
    lack of mount.gfs* will generate an error that is propagated to mount:
    
    oot@node1:~# mount -t  gfs2 /dev/nbd2 /mnt/
    mount: wrong fs type, bad option, bad superblock on /dev/nbd2,
           missing codepage or helper program, or other error
           In some cases useful info is found in syslog - try
           dmesg | tail  or so
    
    [ 3513.303346] GFS2: fsid=: Trying to join cluster "lock_dlm", "gutsy:gfs2"
    [ 3513.304546] DLM/GFS2/GFS ERROR: (u)mount helpers are not installed properly!
    [ 3513.306290] GFS2: fsid=: can't mount proto=lock_dlm, table=gutsy:gfs2, hostdata=
    
    You might want to notice that it will also avoid mount to hang or fail silently
    or with strange errors that will require the cluster to reboot/restart before
    you can actually mount the filesystem again.
    
    Signed-off-by: default avatarFabio M. Di Nitto <fabbione@ubuntu.com>
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
    0b7580c7