dm_io_tracker
struct dm_io_tracker tracker;
static inline void dm_iot_init(struct dm_io_tracker *iot)
static inline bool dm_iot_idle_for(struct dm_io_tracker *iot, unsigned long j)
static inline unsigned long dm_iot_idle_time(struct dm_io_tracker *iot)
static inline void dm_iot_io_begin(struct dm_io_tracker *iot, sector_t len)
static inline void dm_iot_io_end(struct dm_io_tracker *iot, sector_t len)
struct dm_io_tracker iot;