Added stub readv_fop() function
Added stub writev_fop() function
Added stub opendir_fop() function
Added stub readdir_fop() function
Added stub readdirp_fop() function
Added stat_fop() function
Added stub fstat_fop() function, commented out stat_fop() one
Added statfs_fop() function
Added setxattr_fop() function
Added getxattr_fop() function