LOOP_SET_FD		0x4C00
LOOP_CLR_FD		0x4C01
LOOP_SET_STATUS		0x4C02
LOOP_GET_STATUS		0x4C03
LOOP_SET_STATUS64	0x4C04
LOOP_GET_STATUS64	0x4C05
LOOP_CHANGE_FD		0x4C06
LOOP_SET_CAPACITY	0x4C07
LOOP_SET_DIRECT_IO	0x4C08
LOOP_SET_BLOCK_SIZE	0x4C09
LOOP_CTL_ADD		0x4C80
LOOP_CTL_REMOVE		0x4C81
LOOP_CTL_GET_FREE	0x4C82
#stop