1LOOP_SET_FD		0x4C00
2LOOP_CLR_FD		0x4C01
3LOOP_SET_STATUS		0x4C02
4LOOP_GET_STATUS		0x4C03
5LOOP_SET_STATUS64	0x4C04
6LOOP_GET_STATUS64	0x4C05
7LOOP_CHANGE_FD		0x4C06
8LOOP_SET_CAPACITY	0x4C07
9LOOP_SET_DIRECT_IO	0x4C08
10LOOP_CTL_ADD		0x4C80
11LOOP_CTL_REMOVE		0x4C81
12LOOP_CTL_GET_FREE	0x4C82
13#stop
14