Non-default block size confuses gfs2_grow
    
    bz 469773 (originally)
    
    When gfs2_grow calculates the number of new resource groups
    needed for an extended file system, it was doing so using values
    calculated before the superblock was read in.  Therefore it used
    the default block size (4K) regardless of the actual block size.
    This patch moves the call to fix_device_geometry after the
    superblock has been read in so the calculations are done using
    the correct block size.