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fd2ed4d2 MP |
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 | ||
8 | int dm_statistics_init(void); | |
9 | void dm_statistics_exit(void); | |
10 | ||
11 | struct 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 | ||
19 | struct dm_stats_aux { | |
20 | bool merged; | |
c96aec34 | 21 | unsigned long long duration_ns; |
fd2ed4d2 MP |
22 | }; |
23 | ||
24 | void dm_stats_init(struct dm_stats *st); | |
25 | void dm_stats_cleanup(struct dm_stats *st); | |
26 | ||
27 | struct mapped_device; | |
28 | ||
29 | int dm_stats_message(struct mapped_device *md, unsigned argc, char **argv, | |
30 | char *result, unsigned maxlen); | |
31 | ||
32 | void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw, | |
33 | sector_t bi_sector, unsigned bi_sectors, bool end, | |
c96aec34 MP |
34 | unsigned long duration_jiffies, |
35 | struct dm_stats_aux *aux); | |
fd2ed4d2 MP |
36 | |
37 | static inline bool dm_stats_used(struct dm_stats *st) | |
38 | { | |
39 | return !list_empty(&st->list); | |
40 | } | |
41 | ||
42 | #endif |