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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; | |
16 | sector_t last_sector; | |
17 | unsigned last_rw; | |
18 | }; | |
19 | ||
20 | struct dm_stats_aux { | |
21 | bool merged; | |
c96aec34 | 22 | unsigned long long duration_ns; |
fd2ed4d2 MP |
23 | }; |
24 | ||
25 | void dm_stats_init(struct dm_stats *st); | |
26 | void dm_stats_cleanup(struct dm_stats *st); | |
27 | ||
28 | struct mapped_device; | |
29 | ||
30 | int dm_stats_message(struct mapped_device *md, unsigned argc, char **argv, | |
31 | char *result, unsigned maxlen); | |
32 | ||
33 | void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw, | |
34 | sector_t bi_sector, unsigned bi_sectors, bool end, | |
c96aec34 MP |
35 | unsigned long duration_jiffies, |
36 | struct dm_stats_aux *aux); | |
fd2ed4d2 MP |
37 | |
38 | static inline bool dm_stats_used(struct dm_stats *st) | |
39 | { | |
40 | return !list_empty(&st->list); | |
41 | } | |
42 | ||
43 | #endif |