Make sure we don't shrink the device past an active swap file, but allow
shrinking otherwise, as well as growing and balance.
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Omar Sandoval