LXR linux/drivers/md/dm-stats.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef DM_STATS_H
   3#define DM_STATS_H
   4
   5#include <linux/types.h>
   6#include <linux/mutex.h>
   7#include <linux/list.h>
   8
   9int dm_statistics_init(void);
  10void dm_statistics_exit(void);
  11
  12struct dm_stats {
  13        struct mutex mutex;
  14        struct list_head list;  /* list of struct dm_stat */
  15        struct dm_stats_last_position __percpu *last;
  16        sector_t last_sector;
  17        unsigned last_rw;
  18};
  19
  20struct dm_stats_aux {
  21        bool merged;
  22        unsigned long long duration_ns;
  23};
  24
  25void dm_stats_init(struct dm_stats *st);
  26void dm_stats_cleanup(struct dm_stats *st);
  27
  28struct mapped_device;
  29
  30int dm_stats_message(struct mapped_device *md, unsigned argc, char **argv,
  31                     char *result, unsigned maxlen);
  32
  33void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw,
  34                         sector_t bi_sector, unsigned bi_sectors, bool end,
  35                         unsigned long duration_jiffies,
  36                         struct dm_stats_aux *aux);
  37
  38static inline bool dm_stats_used(struct dm_stats *st)
  39{
  40        return !list_empty(&st->list);
  41}
  42
  43#endif
  44