Unserialize ll_link, ll_unlink, ll_mknod.

Updates ll_mknod, _mknod, ll_link, _link, ll_unlink,
_unlink.

Signed-off-by: Matt Benjamin <matt@linuxbox.com>
Fix incorrect cond return from _create_fh.

Signed-off-by: Matt Benjamin <matt@linuxbox.com>
Def. argument fixes in get_or_create.

Signed-off-by: Matt Benjamin <matt@linuxbox.com>