drivers/md/dm-stats.h

   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
   8 int dm_statistics_init(void);
   9 void dm_statistics_exit(void);
  10
  11 struct 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
  19 struct dm_stats_aux {
  20         bool merged;
  21 };
  22
  23 void dm_stats_init(struct dm_stats *st);
  24 void dm_stats_cleanup(struct dm_stats *st);
  25
  26 struct mapped_device;
  27
  28 int dm_stats_message(struct mapped_device *md, unsigned argc, char **argv,
  29                      char *result, unsigned maxlen);
  30
  31 void 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
  35 static inline bool dm_stats_used(struct dm_stats *st)
  36 {
  37         return !list_empty(&st->list);
  38 }
  39
  40 #endif