Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
fd2ed4d2 MP |
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 | ||
9 | int dm_statistics_init(void); | |
10 | void dm_statistics_exit(void); | |
11 | ||
12 | struct dm_stats { | |
13 | struct mutex mutex; | |
14 | struct list_head list; /* list of struct dm_stat */ | |
15 | struct dm_stats_last_position __percpu *last; | |
0cdb90f0 | 16 | bool precise_timestamps; |
fd2ed4d2 MP |
17 | }; |
18 | ||
19 | struct dm_stats_aux { | |
20 | bool merged; | |
c96aec34 | 21 | unsigned long long duration_ns; |
fd2ed4d2 MP |
22 | }; |
23 | ||
d3aa3e06 | 24 | int dm_stats_init(struct dm_stats *st); |
fd2ed4d2 MP |
25 | void dm_stats_cleanup(struct dm_stats *st); |
26 | ||
27 | struct mapped_device; | |
28 | ||
86a3238c HM |
29 | int dm_stats_message(struct mapped_device *md, unsigned int argc, char **argv, |
30 | char *result, unsigned int maxlen); | |
fd2ed4d2 MP |
31 | |
32 | void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw, | |
86a3238c | 33 | sector_t bi_sector, unsigned int bi_sectors, bool end, |
8d394bc4 | 34 | unsigned long start_time, |
c96aec34 | 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 | ||
0cdb90f0 MS |
42 | static inline void dm_stats_record_start(struct dm_stats *stats, struct dm_stats_aux *aux) |
43 | { | |
44 | if (unlikely(stats->precise_timestamps)) | |
45 | aux->duration_ns = ktime_to_ns(ktime_get()); | |
46 | } | |
47 | ||
fd2ed4d2 | 48 | #endif |