__kernel_loff_t
typedef __kernel_loff_t loff_t;
__kernel_loff_t l_start;
__kernel_loff_t l_len;
__kernel_loff_t offset;
#define SNAPSHOT_GET_IMAGE_SIZE _IOR(SNAPSHOT_IOC_MAGIC, 14, __kernel_loff_t)
#define SNAPSHOT_AVAIL_SWAP_SIZE _IOR(SNAPSHOT_IOC_MAGIC, 19, __kernel_loff_t)
#define SNAPSHOT_ALLOC_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 20, __kernel_loff_t)
#define MEMGETBADBLOCK _IOW('M', 11, __kernel_loff_t)
#define MEMSETBADBLOCK _IOW('M', 12, __kernel_loff_t)
__kernel_loff_t loff = 0;