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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef DM_STATS_H
#define DM_STATS_H
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/list.h>
int dm_statistics_init(void);
void dm_statistics_exit(void);
struct dm_stats {
struct mutex mutex;
struct list_head list; /* list of struct dm_stat */
struct dm_stats_last_position __percpu *last;
bool precise_timestamps;
};
struct dm_stats_aux {
bool merged;
unsigned long long duration_ns;
};
void dm_stats_init(struct dm_stats *st);
void dm_stats_cleanup(struct dm_stats *st);
struct mapped_device;
int dm_stats_message(struct mapped_device *md, unsigned int argc, char **argv,
char *result, unsigned int maxlen);
void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw,
sector_t bi_sector, unsigned int bi_sectors, bool end,
unsigned long start_time,
struct dm_stats_aux *aux);
static inline bool dm_stats_used(struct dm_stats *st)
{
return !list_empty(&st->list);
}
static inline void dm_stats_record_start(struct dm_stats *stats, struct dm_stats_aux *aux)
{
if (unlikely(stats->precise_timestamps))
aux->duration_ns = ktime_to_ns(ktime_get());
}
#endif
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