LXR linux/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
   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        unsigned long long duration_ns;
  22};
  23
  24void dm_stats_init(struct dm_stats *st);
  25void dm_stats_cleanup(struct dm_stats *st);
  26
  27struct mapped_device;
  28
  29int dm_stats_message(struct mapped_device *md, unsigned argc, char **argv,
  30                     char *result, unsigned maxlen);
  31
  32void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw,
  33                         sector_t bi_sector, unsigned bi_sectors, bool end,
  34                         unsigned long duration_jiffies,
  35                         struct dm_stats_aux *aux);
  36
  37static inline bool dm_stats_used(struct dm_stats *st)
  38{
  39        return !list_empty(&st->list);
  40}
  41
  42#endif
  43