1#ifndef DM_STATS_H 2#define DM_STATS_H 3 4#include <linux/types.h> 5#include <linux/mutex.h> 6#include <linux/list.h> 7 8int dm_statistics_init(void); 9void dm_statistics_exit(void); 10 11struct dm_stats { 12 struct mutex mutex; 13 struct list_head list; /* list of struct dm_stat */ 14 struct dm_stats_last_position __percpu *last; 15 sector_t last_sector; 16 unsigned last_rw; 17}; 18 19struct dm_stats_aux { 20 bool merged; 21}; 22 23void dm_stats_init(struct dm_stats *st); 24void dm_stats_cleanup(struct dm_stats *st); 25 26struct mapped_device; 27 28int dm_stats_message(struct mapped_device *md, unsigned argc, char **argv, 29 char *result, unsigned maxlen); 30 31void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw, 32 sector_t bi_sector, unsigned bi_sectors, bool end, 33 unsigned long duration, struct dm_stats_aux *aux); 34 35static inline bool dm_stats_used(struct dm_stats *st) 36{ 37 return !list_empty(&st->list); 38} 39 40#endif 41