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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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