Release 4.12 drivers/md/dm-stats.h

#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;
	
sector_t last_sector;
	
unsigned last_rw;
};


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 argc, char **argv,
		     char *result, unsigned maxlen);

void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw,
			 sector_t bi_sector, unsigned bi_sectors, bool end,
			 unsigned long duration_jiffies,
			 struct dm_stats_aux *aux);



static inline bool dm_stats_used(struct dm_stats *st)
{
	return !list_empty(&st->list);
}

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#endif
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Directory: drivers/md

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