overlayfs: implement show_options
This is useful because of the stacking nature of overlayfs. Users like to find out (via /proc/mounts) which lower/upper directory were used at mount time. AV: even failing ovl_parse_opt() could've done some kstrdup() AV: failure of ovl_alloc_entry() should end up with ENOMEM, not EINVAL Signed-off-by: NErez Zadok <ezk@cs.sunysb.edu> Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
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