loop_device 37 include/linux/loop.h int (*transfer)(struct loop_device *, int cmd, loop_device 48 include/linux/loop.h int (*ioctl)(struct loop_device *, int cmd, loop_device 137 include/linux/loop.h int (*transfer)(struct loop_device *lo, int cmd, loop_device 141 include/linux/loop.h int (*init)(struct loop_device *, const struct loop_info64 *); loop_device 143 include/linux/loop.h int (*release)(struct loop_device *); loop_device 144 include/linux/loop.h int (*ioctl)(struct loop_device *, int cmd, unsigned long arg);